Gustafson, R. D., & Frisk, P. D. (1994). College algebra (5th ed.). Brooks/Cole Pub. Co..
Dyfyniad Arddull ChicagoGustafson, R. David, and Peter D. Frisk. College Algebra. 5th ed. Pacific Grove, Calif.: Brooks/Cole Pub. Co., 1994.
Dyfyniad MLAGustafson, R. David, and Peter D. Frisk. College Algebra. 5th ed. Brooks/Cole Pub. Co., 1994.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.