APA استشهاد

Lewis, A. (1949). Principles of economic planning: A study of prepared for the Fabians society.

استشهاد بنمط شيكاغو

Lewis, Arthur. Principles of Economic Planning: A Study of Prepared for the Fabians Society. George Allen & Unwin Ltd., London, 1949.

MLA استشهاد

Lewis, Arthur. Principles of Economic Planning: A Study of Prepared for the Fabians Society. 1949.