Παραπομπή APA

Unesco. (1972). Curricula and syllabi in hydrology. Unesco paris.

Παραπομπή Chicago Style

Unesco. Curricula and Syllabi in Hydrology. UNA: Unesco paris, 1972.

Παραπομπή MLA

Unesco. Curricula and Syllabi in Hydrology. Unesco paris, 1972.