Cita APA (7th ed.)
Seligman, M. E. P., & Hager, J. I. (1972). Biological boundaries of learning.
Cita Chicago (17th ed.)
Seligman, Martín E. P., i Joanne I. Hager. Biological Boundaries of Learning. 1972.
Cita MLA (9th ed.)
Seligman, Martín E. P., i Joanne I. Hager. Biological Boundaries of Learning. 1972.
Atenció: Aquestes cites poden no estar 100% correctes.