Cita APA (7a ed.)

Harrison, S., & Harrison, H. (1990). The Industrial age (First published.). Macmillan.

Cita Chicago Style (17a ed.)

Harrison, Scott, y Hilary Harrison. The Industrial Age. First published. Basingstoke: Macmillan, 1990.

Cita MLA (9a ed.)

Harrison, Scott, y Hilary Harrison. The Industrial Age. First published. Macmillan, 1990.