Singer, I. (1967). Lecture notes on elementary topology and: Geometry. Scott, Foresman.
Cita Chicago (17th ed.)Singer, I.M. Lecture Notes on Elementary Topology and: Geometry. Glenview, Ill.: Scott, Foresman, 1967.
Cita MLA (9th ed.)Singer, I.M. Lecture Notes on Elementary Topology and: Geometry. Scott, Foresman, 1967.
Atenció: Aquestes cites poden no estar 100% correctes.