Robertson, E. F.; O'Connor, J. J. Joseph-Jérôme Lefrançais de Lalande. MacTutor History of Mathematics archive. [21 January 2019]. (原始内容存档于2019-10-23).
Robertson, E. F.; O'Connor, J. J. Joseph-Jérôme Lefrançais de Lalande. MacTutor History of Mathematics archive. [21 January 2019]. (原始内容存档于2019-10-23).