Appleby, M. C., & Hughes, B. O. (1991). Welfare of laying hens in cages and alternative systems: Environmental, physical and behavioural aspects.World’s Poultry Science Journal, 47(2), 109-128.
Appleby, M., Walker, A., Nicol, C., Lindberg, A., Freire, R., Hughes, B., & Elson, H. (2002). Development of furnished cages for laying hens. British Poultry Science, 43(4), 489-500.
The case against cages. (). West Sussex: RSPCA. doi: http://www.rspca.org.uk.ezproxy.library.ubc.ca/ImageLocator/LocateAsset?asset=document&assetId=1232712906556&mode=prd
Dawkins, M. (1977). Do hens suffer in battery cages? environmental preferences and welfare. Animal Behavior, 25(4), 1034-1046.
Deciding to free range your flock. (2012). Retrieved March 17, 2013, from http://www.backyardchickens.com/a/deciding-to-free-range-your-flock
Downing, J. (2012). Non-invasive assessment of stress in commercial housing systems. ( No. US108A). Australia: Australian Egg Corporation Limited.
Elson, A., & Tauson, R. (2011). Furnished cages for laying hens. Glasgow, UK. doi: http://www.wpsa-uk.com/newSite/meetings/30thPoultryScienceSymposium.html
Elson, H. A. (2011). Housing and husbandry of laying hens: Past, present and future. Lohmann Information, 46(2), 16-24.
Elson, H. A., & Croxall, R. (2006). European study on the comparative welfare of laying hens in cage and non-cage systems. Recent Advances in the Assessment of Behavioural Demands in Poultry and Rabbits, Stuttgart-Hohenheim. doi: http://www.ulmer.de/Artikel.dll/m06-32mk_MTczNzMy.PDF
Farm Animal Welfare Council. (2009). Five freedoms. Retrieved March, 16, 2012, from http://www.fawc.org.uk.ezproxy.library.ubc.ca/freedoms.htm
Humane Society International. (2012). HSI canada seeks phase out of battery cages for Canada’s egg laying hens. Retrieved February/4, 2013, fromhttp://www.hsi.org/world/canada/news/releases/2012/01/phase_out_battery_cages_012712.html
Improving the performance of free range poultry production. (2012). Retrieved March 17, 2013, from http://www.poultryhub.org/2012/10/improving-the-performance-of-free-range-poultry-production/
Jendral, M. J., Korver, D. R., Church, J. S., & Feddes, J. J. R. (2008). Bone mineral density and breaking strength of white leghorns housed in conventional, modified, and commercially available colony battery cages. Poultry Science, 87(5), 828-837.
Lindberg, A. C., & Nicol, C. J. (1997). Dustbathing in modified battery cages: Is sham dustbathing an adequate substitute?. Applied Animal Behaviour Science, 55, 113-128.
National Farm Animal Care Council. (2003). Code of practice for the care and handling of poultry – layers. (). Ottawa, Canada: Canadian Agri-Food Research Council. doi: http://www.nfacc.ca/pdfs/codes/Poultry%20Layers%20Code%20of%20Practice.pdf
NIEBUHR, K., ARHANT, C., LUGMAIR, A., GRUBER, B., & ZALUDIK, K. (2009). Foot pad dermatitis in laying hens kept in non-cage systems in austria. (). University of Veterinary Medicine Vienna: Institute of Animal Husbandry and Animal Welfare. doi:http://www.cabi.org.ezproxy.library.ubc.ca/animalscience/Uploads/File/AnimalScience/additionalFiles/WPSACerviaMay2009/6_welfare2009_niebuhr.pdf
Pohle, K., & Cheng, H. W. (2009). Furnished cage system and hen well-being: Comparative effects of furnished cages and battery cages on behavioral exhibitions in white leghorn chickens. Poultry Science, 88(8), 1559-1564.
Savage, T., & Darre, M. J. P. (2008). Internal parasites. (Fact Sheet). New Hampshire: University of New Hampshire. doi:http://extension.unh.edu/resources/files/resource000811_rep844.pdf
Shinmura, T., Eguchi, Y., Uetake, K., & Tanaka, T. (2006). Behavioral changes in laying hens after introduction to battery cages, furnished cages and an aviary. Animal Science Journal, 77(2), 242-249.
Sossidou, E. N., DAL BOSCO, A., ELSON, H. A., & Fontes, C. M. G. A. (2011). Pasture-based systems for poultry production: Implications and perspectives.World’s Poultry Science Journal, 67, 47-58.
Street, B. R. M. S., P.Ag. (2012). The future of confinement housing for egg-laying hens. (). BC SPCA Farm Animal Welfare News: BC SPCA. doi:http://www.spca.bc.ca/assets/documents/welfare/farm/farmsense/feature-story-battery-cage.pdf
Tanaka, T., & Hurnik, J. F. (1992). Comparison of behavior and performance of laying hens housed in battery cages and an aviary. Poultry Science, 71(2), 235-243.
Tauson, R. (1998). Furnished cages and aviaries: Production and health. Poultry Science, 77(12), 1820.
Van Horne, P. L. M. (1995).
Production and economic results of commercial flocks with white layers in aviary systems and battery cages. British Poultry Science, 37(2), 255-261.
Vencomatic. (2013). Retrieved March, 16, 2013, from http://www.vencomatic.ca/