Murphy), J., L., M., (., R., S., A.(1992).Essential mathematics for college students / Arnold R. Steffensen, L. Murphy Johnson (Ed.ke-2).New York:Harper Collins Publishers.
Gaya MLA
Johnson, L., Murphy, (Lee, Murphy)., Steffensen, Arnold, R.."Essential mathematics for college students / Arnold R. Steffensen, L. Murphy Johnson".Ed.ke-2New York:Harper Collins Publishers,1992.Textbook.