APA
United Nation Educational Scientific & Cultural Organization, . (1977). New trends in biology teaching Vol. IV & II. United Nations Educational Scientific and Cultural Organization, Paris: .
Chicago
United Nation Educational Scientific & Cultural Organization, . 1977. New trends in biology teaching Vol. IV & II. United Nations Educational Scientific and Cultural Organization, Paris: .
Harvard
United Nation Educational Scientific & Cultural Organization, . (1977). New trends in biology teaching Vol. IV & II. United Nations Educational Scientific and Cultural Organization, Paris: .
MLA
United Nation Educational Scientific & Cultural Organization, . New trends in biology teaching Vol. IV & II. United Nations Educational Scientific and Cultural Organization, Paris: . 1977.