APA

Beauchamp T. L., Frey R. G., . (2011). The Oxford handbook of animal ethics. Oxford: Oxford University Press.

Chicago

Beauchamp Tom L, Frey Raymond Gillespie, . 2011. The Oxford handbook of animal ethics. Oxford: Oxford University Press.

Harvard

Beauchamp T. L., Frey R. G., . (2011). The Oxford handbook of animal ethics. Oxford: Oxford University Press.

MLA

Beauchamp Tom L, Frey Raymond Gillespie, . The Oxford handbook of animal ethics. Oxford: Oxford University Press. 2011.