Dyfyniad APA

West, S., Pen, I., & Griffin, A. (2002). Cooperation and competition between relatives.

Dyfyniad Arddull Chicago

West, SA, I. Pen, and A. Griffin. Cooperation and Competition Between Relatives. 2002.

Dyfyniad MLA

West, SA, et al. Cooperation and Competition Between Relatives. 2002.

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