Dyfyniad APA

Helson, H., & Bevan, W. (1967). Contemporary approaches to psychology. Van Nostrand.

Dyfyniad Arddull Chicago

Helson, Harry, and William Bevan. Contemporary Approaches to Psychology. Princeton, N.J: Van Nostrand, 1967.

Dyfyniad MLA

Helson, Harry, and William Bevan. Contemporary Approaches to Psychology. Van Nostrand, 1967.

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