Cita APA (7a ed.)

Beggs-Humphreys, M. E., Humphreys, D. W., & Hickson, W. (1972). The world changes (5. ed.). Philip.

Cita Chicago Style (17a ed.)

Beggs-Humphreys, M. E., D. W. Humphreys, y Wilma Hickson. The World Changes. 5. ed. London: Philip, 1972.

Cita MLA (9a ed.)

Beggs-Humphreys, M. E., et al. The World Changes. 5. ed. Philip, 1972.