Cita APA (7a ed.)

Davis, W. M., & Johnson, D. W. (1909). Geographical essays. Ginn and company.

Cita Chicago Style (17a ed.)

Davis, William Morris, y Douglas Wilson Johnson. Geographical Essays. Boston, New York: Ginn and company, 1909.

Cita MLA (8a ed.)

Davis, William Morris, y Douglas Wilson Johnson. Geographical Essays. Ginn and company, 1909.