APA

Howden H. F., Solís A., .Two new species of Geotrupinae (Coleoptera: Scarabaeidae) from Costa Rica. : .

Chicago

Howden Henry F, Solís A, .Two new species of Geotrupinae (Coleoptera: Scarabaeidae) from Costa Rica. : .

Harvard

Howden H. F., Solís A., .Two new species of Geotrupinae (Coleoptera: Scarabaeidae) from Costa Rica. : .

MLA

Howden Henry F, Solís A, .: . .