Cita APA (7a ed.)

Johnston, V. S. (1999). Why we feel: The science of human emotions. Helix Books.

Cita Chicago Style (17a ed.)

Johnston, Victor S. Why We Feel: The Science of Human Emotions. Reading: Helix Books, 1999.

Cita MLA (9a ed.)

Johnston, Victor S. Why We Feel: The Science of Human Emotions. Helix Books, 1999.