Παραπομπή APA

Sickle, J. V. V. (1968). Introduction to economics. D Van Nostrand company.

Παραπομπή Chicago Style

Sickle, John V. Van. Introduction to Economics. New Jersey: D Van Nostrand company, 1968.

Παραπομπή MLA

Sickle, John V. Van. Introduction to Economics. D Van Nostrand company, 1968.