Cita APA

Prager, D. (1998). Happiness Is a serious problem: A human nature reapir manual (1st ed.--.). New York, U.S.A.: Regan Books.

Citación estilo Chicago

Prager, Denis. Happiness Is a Serious Problem: A Human Nature Reapir Manual. 1st ed.--. New York, U.S.A.: Regan Books, 1998.

Cita MLA

Prager, Denis. Happiness Is a Serious Problem: A Human Nature Reapir Manual. 1st ed.--. New York, U.S.A.: Regan Books, 1998.