Jeurissen SH, Lewis F, Van Der Klis JD, Mroz Z, Rebel JM & Ter Huurne AA (2002). ... López RM, Méndez TJ, González EA & Amezcua CM (2001) Veterinaria México 32: 189-.
Australian Journal of Experimental Agriculture 36, 269-275. Barnett JL, Newman EA (1997). ... 231-240. Jongman EC, Barnett JL (2005) Physiological and behavioural aspects of beak-trimming in poultry.
85. A. F. Moss, A. Ghane, Y. Dersjant-Li, T. D. Dao, M. ... 2012) Poultry Science 91: 402–412. Mousavi SN, Afsar A & Lotfollahian H (2013) Journal of Applied Poultry Research 22: 47–.