APA (7th ed.) Citation

Ashton, F., Mills, R., & Potter, B. (2006). Tales of Beatrix Potter. Optimum Releasing.

Chicago Style (17th ed.) Citation

Ashton, Frederick, Reginald Mills, and Beatrix Potter. Tales of Beatrix Potter. [United Kingdom]: Optimum Releasing, 2006.

MLA (8th ed.) Citation

Ashton, Frederick, et al. Tales of Beatrix Potter. Optimum Releasing, 2006.