Cita APA (7th ed.)

Lewis, W. A. (1952). The principles of economic planning (2a. ed.). Unwin University Books.

Cita Chicago (17th ed.)

Lewis, W. Arthur. The Principles of Economic Planning. 2a. ed. Londres: Unwin University Books, 1952.

Cita MLA (9th ed.)

Lewis, W. Arthur. The Principles of Economic Planning. 2a. ed. Unwin University Books, 1952.