Ludwig, E., Paul, E., & Paul, C. (1930). Lincoln. Lincoln History Society.
Chicagoスタイル(17版)引用形式Ludwig, Emil, Eden Paul, , Cedar Paul. Lincoln. New York: Lincoln History Society, 1930.
MLA(9版)引用形式Ludwig, Emil, et al. Lincoln. Lincoln History Society, 1930.
警告: この引用は必ずしも正確ではありません.