UNESCO. (1977). A handbook for the program of man and the biosphere in the United States. Unesco.
Chicago Style (17th ed.) CitationUNESCO. A Handbook for the Program of Man and the Biosphere in the United States. París: Unesco, 1977.
MLA (9th ed.) CitationUNESCO. A Handbook for the Program of Man and the Biosphere in the United States. Unesco, 1977.