APA (7th ed.) Citation

Brockie, G., & Walsh, R. (1986). The twentieth century in focus: Ireland, Europe and the world from 1890. Gill and Macmillan.

Chicago Style (17th ed.) Citation

Brockie, Gerard, and Raymond Walsh. The Twentieth Century in Focus: Ireland, Europe and the World from 1890. Dublin: Gill and Macmillan, 1986.

MLA (9th ed.) Citation

Brockie, Gerard, and Raymond Walsh. The Twentieth Century in Focus: Ireland, Europe and the World from 1890. Gill and Macmillan, 1986.