Gaya APA

Leftwich, R, H. (1984). Student s workbook and study guide to accompany a basic framework for economics (2nd ed.). Plano, Texas: Business Publications, Inc..

Gaya MLA

Leftwich, Richard, H.. "Student s workbook and study guide to accompany a basic framework for economics". 2nd ed. Plano, Texas: Business Publications, Inc., 1984. Text.