References
- Beittel, K. Alternatives for art education research. Dubuque, Iowa: Wm. C. Brown Company Publishers, 1973.
- Fiedler, C. On judging works of visual art. Schaefer-Simmern, H. & Mood, F. (trans.). Berkeley: University of California Press, 1949.
- Lark-Horovitz, B., Lewis, H. & Luca, M. Understanding children's art for better teaching. Columbus, Ohio: Charles E. Merrill Books, Inc., 1967.
- Schaefer-Simmern, H. The unfolding of artistic activity. Berkeley: University of California Press, 1948.
- Schaefer-Simmern, H. The mental foundation of art education in childhood. In H. Lewis (Ed.), Child art: The beginnings of self-affirmation. Berkeley: Diablo Press, 1966.