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