Rees, P. K. (1982). Principles of mathematics. Englewood Cliffs, New Jersey: Prentice-Hall.
Dyfyniad Arddull ChicagoRees, Paul Klein. Principles of Mathematics. Englewood Cliffs, New Jersey: Prentice-Hall, 1982.
Dyfyniad MLARees, Paul Klein. Principles of Mathematics. Englewood Cliffs, New Jersey: Prentice-Hall, 1982.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.