APA (7th ed.) Citation

Sobolewski, P., & MacDonald, J. (1985). Let's look at the 20th century. Gill and Macmillan.

Chicago Style (17th ed.) Citation

Sobolewski, Peter, and John MacDonald. Let's Look at the 20th Century. Dublin: Gill and Macmillan, 1985.

MLA (9th ed.) Citation

Sobolewski, Peter, and John MacDonald. Let's Look at the 20th Century. Gill and Macmillan, 1985.