Elementary topology. [S.l.]: [s.n.].
Trích dẫn kiểu ChicagoElementary Topology. [S.l.]: [s.n.].
MLA引文Elementary Topology. [S.l.]: [s.n.].
警告：這些引文格式不一定是100％准確.
APA引文
Elementary topology. [S.l.]: [s.n.].
Trích dẫn kiểu ChicagoElementary Topology. [S.l.]: [s.n.].
MLA引文Elementary Topology. [S.l.]: [s.n.].