APA

ROLVAAG O. E., COLCORD L., . (1955). Giants in the Earth. New York: Harper and Row, Publishers.

Chicago

ROLVAAG Ole Edvart, COLCORD Lincoln, . 1955. Giants in the Earth. New York: Harper and Row, Publishers.

Harvard

ROLVAAG O. E., COLCORD L., . (1955). Giants in the Earth. New York: Harper and Row, Publishers.

MLA

ROLVAAG Ole Edvart, COLCORD Lincoln, . Giants in the Earth. New York: Harper and Row, Publishers. 1955.