Παραπομπή APA

Grubel, H. G. (1969). International monetary system efficiency and practical alternatives. Penguin.

Παραπομπή Chicago Style

Grubel, Herbert G. International Monetary System Efficiency and Practical Alternatives. England: Penguin, 1969.

Παραπομπή MLA

Grubel, Herbert G. International Monetary System Efficiency and Practical Alternatives. Penguin, 1969.