APA (7th ed.) Citation

Hagen, H. A. Two Species of Aeschna. Wiley.

Chicago Style (17th ed.) Citation

Hagen, Hermann August. Two Species of Aeschna. Wiley.

MLA (9th ed.) Citation

Hagen, Hermann August. Two Species of Aeschna. Wiley.

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