APA (7e ed.) Bronvermelding

Guttman, B. S., & Hopkins, J. W. (1983). Understanding biology. Harcourt Brace Jovanovich.

Chicago (17e ed.) Bronvermelding

Guttman, Burton S., en Johns W. Hopkins. Understanding Biology. New York: Harcourt Brace Jovanovich, 1983.

MLA (9e ed.) Bronvermelding

Guttman, Burton S., en Johns W. Hopkins. Understanding Biology. Harcourt Brace Jovanovich, 1983.