Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (8a ed.)

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