APA (7th ed.) Citation

Sobolewski, P., & MacDonald, J. (1991). Understanding the Modern World. Gill and Macmillan.

Chicago Style (17th ed.) Citation

Sobolewski, Peter, and John MacDonald. Understanding the Modern World. Dublin: Gill and Macmillan, 1991.

MLA (9th ed.) Citation

Sobolewski, Peter, and John MacDonald. Understanding the Modern World. Gill and Macmillan, 1991.

Warning: These citations may not always be 100% accurate.