Παραπομπή APA

Welfling, W., & Vaish, M. C. Principles of economics.

Παραπομπή Chicago Style

Welfling, Weldon, και M. C. Vaish. Principles of Economics. :.

Παραπομπή MLA

Welfling, Weldon, και M. C. Vaish. Principles of Economics.