Παραπομπή σε μορφή APA (7η εκδ.)

Lewis, W. A. (1969). The principles of economic planning: A study prepared for the Fabian Society (New edition with a new introduction.). Universal Book Stall.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Lewis, W. Arthur. The Principles of Economic Planning: A Study Prepared for the Fabian Society. New edition with a new introduction. New Delhi: Universal Book Stall, 1969.

Παραπομπή σε μορφή MLA (8th εκδ.)

Lewis, W. Arthur. The Principles of Economic Planning: A Study Prepared for the Fabian Society. New edition with a new introduction. Universal Book Stall, 1969.