Παραπομπή APA

Free, R. C. (2010). 21st century economics: A reference handbook. Sage.

Παραπομπή Chicago Style

Free, Rhona C. 21st Century Economics: A Reference Handbook. Los Angeles: Sage, 2010.

Παραπομπή MLA

Free, Rhona C. 21st Century Economics: A Reference Handbook. Sage, 2010.