APA (7th ed.) Citation

Xu, W., & Weishu, X. (1990). Study on Beidaihe birds.

Chicago Style (17th ed.) Citation

Xu, Weishu, and Xu Weishu. Study on Beidaihe Birds. Beijing, 1990.

MLA (9th ed.) Citation

Xu, Weishu, and Xu Weishu. Study on Beidaihe Birds. 1990.

Warning: These citations may not always be 100% accurate.