Cita APA (7a ed.)

Garber, J., & Seligman, M. E. P. (1980). Human helplessness: Theory and applications. Academic Press.

Cita Chicago Style (17a ed.)

Garber, Judy, y Martin E. P. Seligman. Human Helplessness: Theory and Applications. New York [etc.]: Academic Press, 1980.

Cita MLA (9a ed.)

Garber, Judy, y Martin E. P. Seligman. Human Helplessness: Theory and Applications. Academic Press, 1980.