Παραπομπή APA

Ferguson, C. E., & Vaish, M. C. (1962). Principles of economics. Duke University.

Παραπομπή Chicago Style

Ferguson, C. E., και M. C. Vaish. Principles of Economics. USA: Duke University, 1962.

Παραπομπή MLA

Ferguson, C. E., και M. C. Vaish. Principles of Economics. Duke University, 1962.