APA

Clark W. H., Blom P. E., .Efficient and inexpensive pitfall trap system. : .

Chicago

Clark William H, Blom Paul E, .Efficient and inexpensive pitfall trap system. : .

Harvard

Clark W. H., Blom P. E., .Efficient and inexpensive pitfall trap system. : .

MLA

Clark William H, Blom Paul E, .: . .