APA (7th ed.) Citation

Ludwig, E., Paul, E., & Paul, C. (1930). Lincoln. Little, Brown, and company.

Chicago Style (17th ed.) Citation

Ludwig, Emil, Eden Paul, and Cedar Paul. Lincoln. Boston: Little, Brown, and company, 1930.

MLA (9th ed.) Citation

Ludwig, Emil, et al. Lincoln. Little, Brown, and company, 1930.