APA

Howden H. F., .Second new world species of Sisyphus Latreille (Coleoptera: Scarabaeidae). : .

Chicago

Howden Henry F, .Second new world species of Sisyphus Latreille (Coleoptera: Scarabaeidae). : .

Harvard

Howden H. F., .Second new world species of Sisyphus Latreille (Coleoptera: Scarabaeidae). : .

MLA

Howden Henry F, .: . .