Παραπομπή σε μορφή APA (7η εκδ.)

Williams, A., & Giardina, E. (1993). Efficiency in the public sector: The theory and practice of cost-benefit analysis. Edward Elgar.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Williams, Alan, και Emilio Giardina. Efficiency in the Public Sector: The Theory and Practice of Cost-benefit Analysis. Brookfield: Edward Elgar, 1993.

Παραπομπή σε μορφή MLA (9th εκδ.)

Williams, Alan, και Emilio Giardina. Efficiency in the Public Sector: The Theory and Practice of Cost-benefit Analysis. Edward Elgar, 1993.