- Author: Robert W. Kirk
- Language: English
- Year: 2016
- Author: Robert Maxwell, Kirk Ambrose
- Language: English
- Year: 2010
- Author: George H Muller, Robert Warren Kirk
- Language: English
- Year: 1976
- Author: Richard B Ford D.V.M., Elisa M Mazzaferro, Robert Warren Kirk, Stephen I Bistner
- Language: English
- Year: 2012