APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

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