Cita APA (7th ed.)

(2004). The World of learning, 2005 (55th ed.). Europa Publications.

Cita Chicago (17th ed.)

The World of Learning, 2005. 55th ed. London: Europa Publications, 2004.

Cita MLA (9th ed.)

The World of Learning, 2005. 55th ed. Europa Publications, 2004.