Παραπομπή APA

Hutchison, T. (1964). Positive Economics and policy objectives. George Allen and unwin ltd.

Παραπομπή Chicago Style

Hutchison, T.W. Positive Economics and Policy Objectives. london: George Allen and unwin ltd, 1964.

Παραπομπή MLA

Hutchison, T.W. Positive Economics and Policy Objectives. George Allen and unwin ltd, 1964.