Unesco. (1972). Curricula and syllabi in hydrology. Unesco paris.
Chicago Style aipamenaUnesco. Curricula and Syllabi in Hydrology. UNA: Unesco paris, 1972.
MLA aipamenaUnesco. Curricula and Syllabi in Hydrology. Unesco paris, 1972.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.