Cita APA (7th ed.)

Ryder, R. D., & Singer, P. (2015). Speciesism, painism and happiness: A morality for the twenty-first century. Imprint Academic.

Cita Chicago (17th ed.)

Ryder, Richard D., i Peter Singer. Speciesism, Painism and Happiness: A Morality for the Twenty-first Century. Exeter, England: Imprint Academic, 2015.

Cita MLA (9th ed.)

Ryder, Richard D., i Peter Singer. Speciesism, Painism and Happiness: A Morality for the Twenty-first Century. Imprint Academic, 2015.