Walker, D. A. (1979). Understanding pictures: A study in the design of appropriate visual materials for education in developing countries. Center for Internat. Education, Univ. of Massachusetts.
Chicago-Zitierstil (17. Ausg.)Walker, David Addison. Understanding Pictures: A Study in the Design of Appropriate Visual Materials for Education in Developing Countries. Amherst, Mass: Center for Internat. Education, Univ. of Massachusetts, 1979.
MLA-Zitierstil (9. Ausg.)Walker, David Addison. Understanding Pictures: A Study in the Design of Appropriate Visual Materials for Education in Developing Countries. Center for Internat. Education, Univ. of Massachusetts, 1979.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.