Harbury, C. (1982). Workbook in Introductory Economics (Third Edition). ELSEVIER.
Chicago Style aipamenaHarbury, Colin. Workbook in Introductory Economics (Third Edition). ELSEVIER, 1982.
MLA aipamenaHarbury, Colin. Workbook in Introductory Economics (Third Edition). ELSEVIER, 1982.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.