et.al, R., A., B., .(2008).COLLEGE MATHEMATICS FOR BUSINESS, ECONOMICS, LIFE SCIENCES, AND SOCIAL SCIENCES .New York:PEARSON EDUCATION INT.
Gaya MLA
et.al, RAYMOND, A, BARNETT, ."COLLEGE MATHEMATICS FOR BUSINESS, ECONOMICS, LIFE SCIENCES, AND SOCIAL SCIENCES".New York:PEARSON EDUCATION INT,2008.Buku Inti.