Killeffer, D. H. (1969). How did you think of that?: An introduction to the scientific method. Doubleday.
Chicago (17e ed.) BronvermeldingKilleffer, David H. How Did You Think of That?: An Introduction to the Scientific Method. Garden City, N.Y: Doubleday, 1969.
MLA (9e ed.) BronvermeldingKilleffer, David H. How Did You Think of That?: An Introduction to the Scientific Method. Doubleday, 1969.
Let op: Deze citaties zijn niet altijd 100% accuraat.