APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (8th ed.) Citation

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

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