APA

Howden H. F., .Some new species and records of north american Scarabaeidae (Coleoptera). : .

Chicago

Howden Henry F, .Some new species and records of north american Scarabaeidae (Coleoptera). : .

Harvard

Howden H. F., .Some new species and records of north american Scarabaeidae (Coleoptera). : .

MLA

Howden Henry F, .: . .