APA

Olson S. L., .Subspecies of grasshopper sparrow (<Ammodramus savannarum>) in Panamá (<Aves: Emberizinae>). : .

Chicago

Olson Storrs L, .Subspecies of grasshopper sparrow (<Ammodramus savannarum>) in Panamá (<Aves: Emberizinae>). : .

Harvard

Olson S. L., .Subspecies of grasshopper sparrow (<Ammodramus savannarum>) in Panamá (<Aves: Emberizinae>). : .

MLA

Olson Storrs L, .: . .