APA (7e ed.) Bronvermelding

STILWELL, J. (1975). Workbook to accompany the fourth edition of an introduction to positive economics. E.L.B.S., Weidenfeld and Nicolson.

Chicago (17e ed.) Bronvermelding

STILWELL, J.A. Workbook to Accompany the Fourth Edition of an Introduction to Positive Economics. London: E.L.B.S., Weidenfeld and Nicolson, 1975.

MLA (9e ed.) Bronvermelding

STILWELL, J.A. Workbook to Accompany the Fourth Edition of an Introduction to Positive Economics. E.L.B.S., Weidenfeld and Nicolson, 1975.