APA (7th ed.) Citation

Valentine, C. W. (1941). The difficult child and the problem of discipline (2d ed.). Sherwood Press.

Chicago Style (17th ed.) Citation

Valentine, C. W. The Difficult Child and the Problem of Discipline. 2d ed. Cleveland, O.: Sherwood Press, 1941.

MLA (9th ed.) Citation

Valentine, C. W. The Difficult Child and the Problem of Discipline. 2d ed. Sherwood Press, 1941.