Παραπομπή APA

Harbury, C. (1982). Workbook in introductory economics (3rd ed.). Pergamon.

Παραπομπή Chicago Style

Harbury, Colin. Workbook in Introductory Economics. 3rd ed. Oxford: Pergamon, 1982.

Παραπομπή MLA

Harbury, Colin. Workbook in Introductory Economics. 3rd ed. Pergamon, 1982.