Nellis, J. R. (1989). Contract plans and public enterprise performance. World Bank.
Chicago Style aipamenaNellis, John R. Contract Plans and Public Enterprise Performance. Washington: World Bank, 1989.
MLA aipamenaNellis, John R. Contract Plans and Public Enterprise Performance. World Bank, 1989.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.