APA (7e ed.) Bronvermelding

Killeffer, D. H. (1969). How did you think of that?: An introduction to the scientific method. Doubleday.

Chicago (17e ed.) Bronvermelding

Killeffer, David H. How Did You Think of That?: An Introduction to the Scientific Method. Garden City, N.Y: Doubleday, 1969.

MLA (9e ed.) Bronvermelding

Killeffer, David H. How Did You Think of That?: An Introduction to the Scientific Method. Doubleday, 1969.