Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.