APA (7th ed.) Zitazioa
ITYAVYAR, D. (1990). HEALTH SERVICES INEQUALITIES IN NIGERIA.
Chicago Style (17th ed.) Zitazioa
ITYAVYAR, D.A. HEALTH SERVICES INEQUALITIES IN NIGERIA. 1990.
MLA (9th ed.) Zitazioa
ITYAVYAR, D.A. HEALTH SERVICES INEQUALITIES IN NIGERIA. 1990.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.