APA (7th ed.) Citation

Cussler, C., & Cussler, D. (2019). Celtic empire: A Dirk Pitt novel. G.P. Putnam's Sons.

Chicago Style (17th ed.) Citation

Cussler, Clive, and Dirk Cussler. Celtic Empire: A Dirk Pitt Novel. New York: G.P. Putnam's Sons, 2019.

MLA (8th ed.) Citation

Cussler, Clive, and Dirk Cussler. Celtic Empire: A Dirk Pitt Novel. G.P. Putnam's Sons, 2019.

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