APA

Olson L. R., Green J. C., .Introduction--"Gapology" and the presidential vote. : .

Chicago

Olson Laura R, Green John C, .Introduction--"Gapology" and the presidential vote. : .

Harvard

Olson L. R., Green J. C., .Introduction--"Gapology" and the presidential vote. : .

MLA

Olson Laura R, Green John C, .: . .