Williams, C. M. (1968). Learning from pictures (2d ed.). Dept. of Audiovisual Instruction, National Education Association.
Chicago-referens (17:e uppl.)Williams, Catharine M. Learning from Pictures. 2d ed. Washington: Dept. of Audiovisual Instruction, National Education Association, 1968.
MLA-referens (8:e uppl.)Williams, Catharine M. Learning from Pictures. 2d ed. Dept. of Audiovisual Instruction, National Education Association, 1968.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.