APA Citation

Pratchett, T. 1., & Aaronovitch, B. (1990). Guards! Guards!: A Discworld® novel. London: Corgi Books.

Chicago Style Citation

Pratchett, Terry 1948-2015, and Ben Aaronovitch. Guards! Guards!: A Discworld® Novel. London: Corgi Books, 1990.

MLA Citation

Pratchett, Terry 1948-2015, and Ben Aaronovitch. Guards! Guards!: A Discworld® Novel. London: Corgi Books, 1990.

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