APA (7th ed.) Citation

Duncan, W. C., & Hart, E. H. (1940). Dog training made easy for you and your dog. Bell.

Chicago Style (17th ed.) Citation

Duncan, William Cary, and Ernest H. Hart. Dog Training Made Easy for You and Your Dog. New York: Bell, 1940.

MLA (9th ed.) Citation

Duncan, William Cary, and Ernest H. Hart. Dog Training Made Easy for You and Your Dog. Bell, 1940.