APA (7e ed.) Bronvermelding
Gardner, L. C. (1966). A different frontier: Selected readings in the foundations of American economic expansion. Quadrangle Books.
Chicago (17e ed.) Bronvermelding
Gardner, Lloyd C. A Different Frontier: Selected Readings in the Foundations of American Economic Expansion. Chicago: Quadrangle Books, 1966.
MLA (9e ed.) Bronvermelding
Gardner, Lloyd C. A Different Frontier: Selected Readings in the Foundations of American Economic Expansion. Quadrangle Books, 1966.
Let op: Deze citaties zijn niet altijd 100% accuraat.