1. Tully , T.N. 2007 The avian physical examination NAVC Clinician's Brief Feb 74 78
2. Spiegle , S.J. Ison , A.J. Morishita , T.Y. 2012 Performing a Physical Examination on a Chicken . The Ohio State University Extension Fact Sheet http://ohioline.osu.edu/vme-fact/0020.html