Παραπομπή APA

Stiwell, J. A., & Lipsey, R. G. (1971). Workbook to Accompany: An Instroduction to Positive Economics (2nd ed.). English Language Book Society.

Παραπομπή Chicago Style

Stiwell, J A., και Richard G. Lipsey. Workbook to Accompany: An Instroduction to Positive Economics. 2nd ed. London: English Language Book Society, 1971.

Παραπομπή MLA

Stiwell, J A., και Richard G. Lipsey. Workbook to Accompany: An Instroduction to Positive Economics. 2nd ed. English Language Book Society, 1971.