Gordon, S. D., & Dawson, G. G. (1987). Instructor's guide with test items for Introductory economics (6th ed.). D.C. Heath.
Citazione stile Chigago Style (17a edizione)Gordon, Sanford D., e George Glenn Dawson. Instructor's Guide with Test Items for Introductory Economics. 6th ed. Lexington, Mass.: D.C. Heath, 1987.
Citatione MLA (9a ed.)Gordon, Sanford D., e George Glenn Dawson. Instructor's Guide with Test Items for Introductory Economics. 6th ed. D.C. Heath, 1987.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.