APA

Smith D. E. P., Haag C., . (1961). Learning to learn. New York: Harcourt, Brace & World.

Chicago

Smith Donald E P, Haag Carl, . 1961. Learning to learn. New York: Harcourt, Brace & World.

Harvard

Smith D. E. P., Haag C., . (1961). Learning to learn. New York: Harcourt, Brace & World.

MLA

Smith Donald E P, Haag Carl, . Learning to learn. New York: Harcourt, Brace & World. 1961.