creedy, j., Evans, L., & Thomas, B. (1984). Economics: An integrated approach. Prentice-hall international.
Cita Chicago (17th ed.)creedy, john, Lynne Evans, i Barry Thomas. Economics: An Integrated Approach. London: Prentice-hall international, 1984.
Cita MLA (9th ed.)creedy, john, et al. Economics: An Integrated Approach. Prentice-hall international, 1984.