1. Baumel JJ, King AS, Lucas AM, Breazile JE, Evans HE (eds) (1979) Nomina Anatomica Avium, an annotated dictionary of birds. London New York, Academic Press
2. Beckham C, Greenlee TK (1975) Chick vincula: elastic structures with a check-rein mechanism. J Anat 119 (2):295?308
3. Bent AC (1940) Life histories of North American goatsuckers, Hummingbirds and Their Allies, Washington, US Govt Printing Office, pp 147?252
4. Bent AC (1963) Life histories of North American marsh birds. New York, Dover Publ, pp 356?366
5. Berger AJ (1966) The musculature. In: George JC, Berger AJ (eds) Avian myology. New York, London, Academic Press, pp 224?473