Gaya APA

Leftwich, R, H., Sharp, A, M. (1982). ECONOMICS OF SOCIAL ISSUES (Ed. 5). Amerika: Businnes Publication, Inc.

Gaya MLA

Leftwich, Richard, H.., Sharp, Ansel, M.. "ECONOMICS OF SOCIAL ISSUES". Ed. 5 Amerika: Businnes Publication, Inc, 1982. Text.