APA

Rølvaag O. E., Colcord L., . (1929). Giants in the earth: a saga of the prairie. New York: Harper & Row.

Chicago

Rølvaag O E, Colcord Lincoln, . 1929. Giants in the earth: a saga of the prairie. New York: Harper & Row.

Harvard

Rølvaag O. E., Colcord L., . (1929). Giants in the earth: a saga of the prairie. New York: Harper & Row.

MLA

Rølvaag O E, Colcord Lincoln, . Giants in the earth: a saga of the prairie. New York: Harper & Row. 1929.