Lua APA (7ú heag.)

Lefton, L. A. (1997). Psychology (6th ed.). Kentucky State University.

Lua i Stíl Chicago (17ú heag.)

Lefton, Lester A. Psychology. 6th ed. Kentucky: Kentucky State University, 1997.

Lua MLA (9ú heag.)

Lefton, Lester A. Psychology. 6th ed. Kentucky State University, 1997.

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