Spivak, M. (1999). A comprehensive introduction to differential geometry (Third edition.). Publish or Perish, Inc..
Cita Chicago (17th ed.)Spivak, Michael. A Comprehensive Introduction to Differential Geometry. Third edition. Houston, Tex.: Publish or Perish, Inc., 1999.
Cita MLA (8th ed.)Spivak, Michael. A Comprehensive Introduction to Differential Geometry. Third edition. Publish or Perish, Inc., 1999.
Atenció: Aquestes cites poden no estar 100% correctes.