M., P., G., 1928, W., C., L.(1988).Algebra for college students / Gilbert M. Peter, C. Lee Welch .Glenview, Illinois:Scott Foresman.
Gaya MLA
Peter, Gilbert, M.., Welch, C., Lee,, 1928."Algebra for college students / Gilbert M. Peter, C. Lee Welch".Glenview, Illinois:Scott Foresman,1988.Textbook.