Cita APA (7a ed.)

(1978). The World of Learning 1978-79 (29th ed.). Europa.

Cita Chicago Style (17a ed.)

The World of Learning 1978-79. 29th ed. London: Europa, 1978.

Cita MLA (9a ed.)

The World of Learning 1978-79. 29th ed. Europa, 1978.