APA (7th ed.) Zitazioa

Spencer, H. (1970). The principles of psychology. Gregg International Publishers Limited.

Chicago Style (17th ed.) Zitazioa

Spencer, Herbert. The Principles of Psychology. Farnham: Gregg International Publishers Limited, 1970.

MLA (9th ed.) Zitazioa

Spencer, Herbert. The Principles of Psychology. Gregg International Publishers Limited, 1970.

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