Zachariah, P. a. R. (1996). Encyclopedia of Economics, Commerce & Management: Vol. 15 Services sector management (ed.). Mittal.
Chicago-referens (17:e uppl.)Zachariah, Peter and Rajpal. Encyclopedia of Economics, Commerce & Management: Vol. 15 Services Sector Management. ed. New Delhi: Mittal, 1996.
MLA-referens (9:e uppl.)Zachariah, Peter and Rajpal. Encyclopedia of Economics, Commerce & Management: Vol. 15 Services Sector Management. ed. Mittal, 1996.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.