APA引文

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

Chicago Style (17th ed.) Citation

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

MLA引文

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

警告：这些引文格式不一定是100％准确.