Waterdrinker, Pieter
Liebmans Ring
Uitgeverij De Arbeiderspers, 2001
 Buku Teks
Bloom, Allan
The Closing of the American mind / Allan Bloom
Simon and Schuster, 1987
 Buku Teks
Ring theory: proceedings
edited by Robert Gordon
Academic Press, 1972
 Buku Teks
Homan, Welmoed
Reis van de ring
Wolters-Noordhoff, 2000
 Buku Teks
Hartley, B.
Ring's modules and linear algebra
Chapman and Hall, 1992
 Buku Teks