Cita APA (7a ed.)

Harrison, S., & Harrison, H. (1991). The modern world (First published.). Macmillan.

Cita Chicago Style (17a ed.)

Harrison, Scott, y Hilary Harrison. The Modern World. First published. Basingstoke: Macmillan, 1991.

Cita MLA (9a ed.)

Harrison, Scott, y Hilary Harrison. The Modern World. First published. Macmillan, 1991.