Cita APA (7th ed.)
Gardner, L. C. (1966). A different frontier: Selected readings in the foundations of American economic expansion. Quadrangle Books.
Cita Chicago (17th ed.)
Gardner, Lloyd C. A Different Frontier: Selected Readings in the Foundations of American Economic Expansion. Chicago: Quadrangle Books, 1966.
Cita MLA (9th ed.)
Gardner, Lloyd C. A Different Frontier: Selected Readings in the Foundations of American Economic Expansion. Quadrangle Books, 1966.
Atenció: Aquestes cites poden no estar 100% correctes.