APA

Gertsch W. J., .Report on cavernicole and epigean spiders from the Yucatan Peninsula. : .

Chicago

Gertsch Willis J, .Report on cavernicole and epigean spiders from the Yucatan Peninsula. : .

Harvard

Gertsch W. J., .Report on cavernicole and epigean spiders from the Yucatan Peninsula. : .

MLA

Gertsch Willis J, .: . .