APA (7. basım) Alıntı

Leffler, G. L. (1952). Seasonal changes in Pennsylvania business.

Chicago Style (17. basım) Atıf

Leffler, George Leland. Seasonal Changes in Pennsylvania Business. State College, 1952.

MLA (8th ed.) Atıf

Leffler, George Leland. Seasonal Changes in Pennsylvania Business. 1952.