APA Citation

Grayum, M. H., & Churchill, H. W. The vascular flora of La Selva Biological Station, Costa Rica: Polypodiophyta.

Chicago Style Citation

Grayum, Michael H., and Hugh W. Churchill. The Vascular Flora of La Selva Biological Station, Costa Rica: Polypodiophyta.

MLA Citation

Grayum, Michael H., and Hugh W. Churchill. The Vascular Flora of La Selva Biological Station, Costa Rica: Polypodiophyta.

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