Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

Metcalf, David. The Economics of Agriculture. Harmondsworth [etc.]: Penguin Books, 1969.

Cita MLA (9a ed.)

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