APA Citation

Gertsch, W. J. 1., & Gertsch, W. J. 1. (1949). American spiders. Princeton, N.J.: Van Nostrand.

Chicago Style Citation

Gertsch, Willis John 1906-, and Willis John 1906- Gertsch. American Spiders. Princeton, N.J.: Van Nostrand, 1949.

MLA Citation

Gertsch, Willis John 1906-, and Willis John 1906- Gertsch. American Spiders. Princeton, N.J.: Van Nostrand, 1949.

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