APA Citation

Hefti, D., & Tomka, I. (1988). Contribution to the taxonomy of Est-European species of the Ecdyonurus helveticus-group (Ephemeroptera, Heptageniidae).

MLA Citation

Hefti, Daniel, and Ivan Tomka. Contribution to the Taxonomy of Est-European Species of the Ecdyonurus Helveticus-group (Ephemeroptera, Heptageniidae). 1988.

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