Gaya APA
Student Workbook for Principles of Economics. (1991).
Jakarta:
.
Gaya Chicago
Student Workbook for Principles of Economics.
Edisi Pertama.
Jakarta:
,
1991.
Text.
Gaya MLA
Student Workbook for Principles of Economics.
Edisi Pertama.
Jakarta:
,
1991.
Text.
Gaya Turabian
Student Workbook for Principles of Economics.
Jakarta:
,
1991.
Print.