Klausmeier, H. J., & Ripple, R. E. (1971). Learning and human abilities: Educational psychology (3d ed.). Harper & Row.
Lua i Stíl Chicago (17ú heag.)Klausmeier, Herbert John, agus Richard E. Ripple. Learning and Human Abilities: Educational Psychology. 3d ed. New York: Harper & Row, 1971.
Lua MLA (9ú heag.)Klausmeier, Herbert John, agus Richard E. Ripple. Learning and Human Abilities: Educational Psychology. 3d ed. Harper & Row, 1971.
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