Harriman, P. L., & Charles E. Skinner. (1958). Essentials of educational psychology. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)Harriman, Philip Lawrence, agus Charles E. Skinner. Essentials of Educational Psychology. Englewood Cliffs, N. J: Prentice-Hall, 1958.
Lua MLA (9ú heag.)Harriman, Philip Lawrence, agus Charles E. Skinner. Essentials of Educational Psychology. Prentice-Hall, 1958.
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