Vella, J. (1979). Visual Aids for nonformal education: A field guide to the production and use of inexpensive visual aids in nonformal education. Center for International Education, University of Massachusetts.
Chicago-Zitierstil (17. Ausg.)Vella, Jane. Visual Aids for Nonformal Education: A Field Guide to the Production and Use of Inexpensive Visual Aids in Nonformal Education. Amherst, Mass: Center for International Education, University of Massachusetts, 1979.
MLA-Zitierstil (9. Ausg.)Vella, Jane. Visual Aids for Nonformal Education: A Field Guide to the Production and Use of Inexpensive Visual Aids in Nonformal Education. Center for International Education, University of Massachusetts, 1979.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.