Tham khảo Hàm_đồng_nhất

  1. ↑ Knapp, Anthony W. (2006), Basic algebra, Springer, ISBN 978-0-8176-3248-9 
  2. ↑ D. Marshall; E. Odell; M. Starbird (2007). Number Theory through Inquiry. Mathematical Association of America Textbooks. Mathematical Assn of Amer. ISBN 978-0883857519. 
  3. ↑ Anton, Howard (2014). Elementary Linear Algebra (ấn bản 11). Hoboken, NJ: John Wiley & Sons. ISBN 978-1-118-43441-3. OCLC 908199768. 
  4. ↑ T. S. Shores (2007). Applied Linear Algebra and Matrix Analysis. Undergraduate Texts in Mathematics. Springer. ISBN 038-733-195-6. 
  5. ↑ James W. Anderson, Hyperbolic Geometry, Springer 2005, ISBN 1-85233-934-9