APA

Olson S. L., .Distribution of the races of Arremon aurantiirostris (<Emberizinae>) in Panama. : .

Chicago

Olson Storrs L, .Distribution of the races of Arremon aurantiirostris (<Emberizinae>) in Panama. : .

Harvard

Olson S. L., .Distribution of the races of Arremon aurantiirostris (<Emberizinae>) in Panama. : .

MLA

Olson Storrs L, .: . .