Fitz-enz,Jac. (2009). The ROI of human capital: Measuring the economic value of employee performance (2nd ed.). AMACOM.
Lua i Stíl Chicago (17ú heag.)Fitz-enz,Jac. The ROI of Human Capital: Measuring the Economic Value of Employee Performance. 2nd ed. New York: AMACOM, 2009.
Lua MLA (9ú heag.)Fitz-enz,Jac. The ROI of Human Capital: Measuring the Economic Value of Employee Performance. 2nd ed. AMACOM, 2009.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.