Abs, R. Louis Bertrand 15.01.1856 - 17.06.1943. [S.l.]: [s.n.].
Chicago Style (17th ed.) CitationAbs, Robert. Louis Bertrand 15.01.1856 - 17.06.1943. [S.l.]: [s.n.].
MLA引文Abs, Robert. Louis Bertrand 15.01.1856 - 17.06.1943. [S.l.]: [s.n.].
警告:這些引文格式不一定是100%准確.