Tohutoro APA (7th ed.)
Trahan, M., & Gray, P. (1991). Focus on psychology: A guide to mastering Peter Gray's psychology. Worth.
Tohutoru Kātū Chicago (17th ed.)
Trahan, Mary, me Peter Gray. Focus on Psychology: A Guide to Mastering Peter Gray's Psychology. New York: Worth, 1991.
Tohutoro MLA (9th ed.)
Trahan, Mary, me Peter Gray. Focus on Psychology: A Guide to Mastering Peter Gray's Psychology. Worth, 1991.
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