Giants in the earth,
by O.E. Rölvaag, with an introd. by Vernon L. Parrington.

APA Citation

Rølvaag, O. E. (Ole Edvart)., Colcord, L., Parrington, V. Louis. (1929). Giants in the earth. New York: Harper & brothers.

MLA Citation

Rølvaag, O. E. (Ole Edvart), 1876-1931, Lincoln Colcord, and Vernon Louis Parrington. Giants In the Earth. New York: Harper & brothers, 1929.

Warning: These citations may not always be complete (especially for serials).