APA

Howswn, Campbell J. M., .Observations on some Scarabaeoidea in the Colombian Sierra Nevada de Santa Marta. : .

Chicago

Howswn, Campbell J M, .Observations on some Scarabaeoidea in the Colombian Sierra Nevada de Santa Marta. : .

Harvard

Howswn, Campbell J. M., .Observations on some Scarabaeoidea in the Colombian Sierra Nevada de Santa Marta. : .

MLA

Howswn, Campbell J M, .: . .