Cita APA (7th ed.)
Powell, G. Happiness is a habitat: Release from guilt and fear. Guide Post.
Cita Chicago (17th ed.)
Powell, Gordon. Happiness Is a Habitat: Release from Guilt and Fear. New York: Guide Post.
Cita MLA (9th ed.)
Powell, Gordon. Happiness Is a Habitat: Release from Guilt and Fear. Guide Post.
Atenció: Aquestes cites poden no estar 100% correctes.