Cita APA

(1987). The World of learning 1987: The standard and authoritative guide to educational, scientific and cultural institutions all over the world (37th ed.). Europa.

Citación estilo Chicago

The World of Learning 1987: The Standard and Authoritative Guide to Educational, Scientific and Cultural Institutions All over the World. 37th ed. London: Europa, 1987.

Cita MLA

The World of Learning 1987: The Standard and Authoritative Guide to Educational, Scientific and Cultural Institutions All over the World. 37th ed. Europa, 1987.