Gilbert, C., Powell, A., & Vines, D. (1999). Positioning the World Bank.
Chicago Style aipamenaGilbert, C., A. Powell, and D. Vines. Positioning the World Bank. 1999.
MLA aipamenaGilbert, C., et al. Positioning the World Bank. 1999.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.