1. Syrina Al Aïn , Nicolas Giret , Marion Grand , Michel Kreutzer , and Dalila Bovet . 2009. The discrimination of discrete and continuous amounts in African grey parrots (Psittacus erithacus). Animal cognition 12, 1 ( 2009 ), 145–154. Syrina Al Aïn, Nicolas Giret, Marion Grand, Michel Kreutzer, and Dalila Bovet. 2009. The discrimination of discrete and continuous amounts in African grey parrots (Psittacus erithacus). Animal cognition 12, 1 (2009), 145–154.
2. Measuring animal preferences and choice behavior;Amdam GV;Nature Education Knowledge,2011
3. American Pet Products Association 2018. 2017–2018 APPA national pet owners survey. americanpetproducts. org [Internet]. APPA(2018). American Pet Products Association 2018. 2017–2018 APPA national pet owners survey. americanpetproducts. org [Internet]. APPA(2018).
4. Eric PS Baumer . 2015 . Usees. In Proceedings of the 33rd Annual ACM Conference on Human Factors in Computing Systems. 3295–3298 . Eric PS Baumer. 2015. Usees. In Proceedings of the 33rd Annual ACM Conference on Human Factors in Computing Systems. 3295–3298.
5. Peter H Beynon , Neil A Forbes , and Martin PC Lawton . 1996. BSAVA manual of psittacine birds . British Small Animal Veterinary Association, Kingsley House , Shardington. Peter H Beynon, Neil A Forbes, and Martin PC Lawton. 1996. BSAVA manual of psittacine birds. British Small Animal Veterinary Association, Kingsley House, Shardington.