APA

Olson S. L., .Geographic variation in the yellow warblers (<Dendroica petechia: Parulidae>) of the Pacific coast of middle and South America. : .

Chicago

Olson Storrs L, .Geographic variation in the yellow warblers (<Dendroica petechia: Parulidae>) of the Pacific coast of middle and South America. : .

Harvard

Olson S. L., .Geographic variation in the yellow warblers (<Dendroica petechia: Parulidae>) of the Pacific coast of middle and South America. : .

MLA

Olson Storrs L, .: . .