APA

Ludwig E., Lindsay M. H., . (1937). The Nile: the life-story of a river. New York: The Viking press.

Chicago

Ludwig Emil, Lindsay Mary H, . 1937. The Nile: the life-story of a river. New York: The Viking press.

Harvard

Ludwig E., Lindsay M. H., . (1937). The Nile: the life-story of a river. New York: The Viking press.

MLA

Ludwig Emil, Lindsay Mary H, . The Nile: the life-story of a river. New York: The Viking press. 1937.