Dyfyniad APA

Petrie, T. A., & Trent A. Petrie; Eric L. Denson. (2003). A: Peak performance in class and life. Belmont, CA: Thomson/Wadsworth learning.

Dyfyniad Arddull Chicago

Petrie, Trent A., và Trent A. Petrie; Eric L. Denson. A: Peak Performance in Class and Life. Belmont, CA: Thomson/Wadsworth learning, 2003.

Dyfyniad MLA

Petrie, Trent A., và Trent A. Petrie; Eric L. Denson. A: Peak Performance in Class and Life. Belmont, CA: Thomson/Wadsworth learning, 2003.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.