1. ABPA. (2014). Relatorio anual 2014. Relatorio Anual. http://www.ubabef.com.br/files/publicacoes/8ca705e70f0cb110ae3aed67d29c8842.pdf . Accessed October 29, 2014
2. AFS. (2012). Red tractor assurance annual review. Assured food standard. http://www.redtractor.org.uk/contentfiles/RedTractor-522.pdf . Accessed May 10, 2015
3. AFS. (2014). Red tractor assurance. Red tractor assurance safe haven and post-farm schemes. http://assurance.redtractor.org.uk/rtassurance/schemes/aboutschemes/content.eb . Accessed 26 November 2014
4. Amos, N., & Sullivan, R. (2014). The 2013 Business Benchmark on Farm Animal Welfare. Investor Briefing. http://www.bbfaw.com/wp-content/uploads/2010/08/Briefing-No12-Business-Benchmark-2013.pdf . Accessed June 01, 2015
5. Areté Research & Consulting in Economics. (2010). Inventory of certification schemes for agricultural products and foodstuffs marketed in the EU Member States. Brussels. http://ec.europa.eu/agriculture/quality/certification/inventory/inventory-data-aggregations_en.pdf . Accessed June 01, 2015