Cita APA (7a ed.)

Ludwig, E., Paul, E., & Paul, C. (1930). Lincoln. Lincoln History Society.

Cita Chicago Style (17a ed.)

Ludwig, Emil, Eden Paul, y Cedar Paul. Lincoln. New York: Lincoln History Society, 1930.

Cita MLA (9a ed.)

Ludwig, Emil, et al. Lincoln. Lincoln History Society, 1930.