APA (7th ed.) Citation

Riddlesbarger, A., & Stillwagon, N. (1935). Easy English exercises (New ed.). World Book Co..

Chicago Style (17th ed.) Citation

Riddlesbarger, Ada, and Nell Stillwagon. Easy English Exercises. New ed. Yonkers-on-Hudson, N.Y.: World Book Co., 1935.

MLA (8th ed.) Citation

Riddlesbarger, Ada, and Nell Stillwagon. Easy English Exercises. New ed. World Book Co., 1935.