Cita APA

IUCN. (1973). Twelfth technical meeting. [S.l.]: [s.n.].

Citación estilo Chicago

IUCN. Twelfth Technical Meeting. [S.l.]: [s.n.], 1973.

Cita MLA

IUCN. Twelfth Technical Meeting. [S.l.]: [s.n.], 1973.