Gaya APA

Sergeant, E., Perkins, N. (2015). Epidemiology for Field Veterinarians An Introduction . London, UK: Silke Hecht.

Gaya MLA

Sergeant, Evan., Perkins, Nigel. "Epidemiology for Field Veterinarians An Introduction". London, UK: Silke Hecht, 2015. e-book.