APA (7th ed.) Citation

Knott, R., & Parker, R. B. (2013). Robert B. Parker's Ironhorse. G.P. Putnam's Sons.

Chicago Style (17th ed.) Citation

Knott, Robert, and Robert B. Parker. Robert B. Parker's Ironhorse. New York: G.P. Putnam's Sons, 2013.

MLA (9th ed.) Citation

Knott, Robert, and Robert B. Parker. Robert B. Parker's Ironhorse. G.P. Putnam's Sons, 2013.

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