Παραπομπή APA

Helliwell, J. F. (1976). Aggregate investment: Selected readings. Harmondsworth ; Baltimore: Penguin Education.

Παραπομπή Chicago Style

Helliwell, John F. Aggregate Investment: Selected Readings. Harmondsworth ; Baltimore: Penguin Education, 1976.

Παραπομπή MLA

Helliwell, John F. Aggregate Investment: Selected Readings. Harmondsworth ; Baltimore: Penguin Education, 1976.

Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.