Harbury, C. (1982). Workbook in Introductory Economics (Third Edition). ELSEVIER.
Cita Chicago (17th ed.)Harbury, Colin. Workbook in Introductory Economics (Third Edition). ELSEVIER, 1982.
Cita MLA (8th ed.)Harbury, Colin. Workbook in Introductory Economics (Third Edition). ELSEVIER, 1982.
Atenció: Aquestes cites poden no estar 100% correctes.