APA

Stevens G. C., .Elevational gradient in altitudinal range: an extension of rapoport's latitudinal rule to altitude. : .

Chicago

Stevens George C, .Elevational gradient in altitudinal range: an extension of rapoport's latitudinal rule to altitude. : .

Harvard

Stevens G. C., .Elevational gradient in altitudinal range: an extension of rapoport's latitudinal rule to altitude. : .

MLA

Stevens George C, .: . .