APA način citiranja (7. izdanje)

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

Čikaški stil citiranja (17. izdanje)

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

MLA način citiranja (8. izdanje)

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