Cita APA (7th ed.)

(1996). The World of learning, 1997 (47th ed.). Europa Pub.

Cita Chicago (17th ed.)

The World of Learning, 1997. 47th ed. London: Europa Pub, 1996.

Cita MLA (9th ed.)

The World of Learning, 1997. 47th ed. Europa Pub, 1996.