Cita APA

IUCN. (1964). Environmental Education in an urban society, 1972. [S.l.]: [s.n.].

Citación estilo Chicago

IUCN. Environmental Education in an Urban Society, 1972. [S.l.]: [s.n.], 1964.

Cita MLA

IUCN. Environmental Education in an Urban Society, 1972. [S.l.]: [s.n.], 1964.