Cita APA (7a ed.)

Harris, M., & Mower, D. (1992). World Class: Elementary (2a. ed.). Longman.

Cita Chicago Style (17a ed.)

Harris, Michael, y David Mower. World Class: Elementary. 2a. ed. Londres: Longman, 1992.

Cita MLA (8a ed.)

Harris, Michael, y David Mower. World Class: Elementary. 2a. ed. Longman, 1992.