Cita APA (7th ed.)

Metcalf, D. H. (1969). The economics of agriculture. Penguin.

Cita Chicago (17th ed.)

Metcalf, David H. The Economics of Agriculture. Harmondsworth: Penguin, 1969.

Cita MLA (8th ed.)

Metcalf, David H. The Economics of Agriculture. Penguin, 1969.