(1987). The World of learning 1987: The standard and authoritative guide to educational, scientific and cultural institutions all over the world (37th ed.). Europa.
Citazione stile Chigago Style (17a edizione)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.
Citatione MLA (9a ed.)The World of Learning 1987: The Standard and Authoritative Guide to Educational, Scientific and Cultural Institutions All over the World. 37th ed. Europa, 1987.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.