Briggs, T. R. (1983). An investigation of the efficiency and effectiveness of three nonvocal communication systems with severely handicapped students. Univ. Microfilms Internat.
Chicago-Zitierstil (17. Ausg.)Briggs, Thomas R. An Investigation of the Efficiency and Effectiveness of Three Nonvocal Communication Systems with Severely Handicapped Students. Ann Arbor, Mich: Univ. Microfilms Internat, 1983.
MLA-Zitierstil (9. Ausg.)Briggs, Thomas R. An Investigation of the Efficiency and Effectiveness of Three Nonvocal Communication Systems with Severely Handicapped Students. Univ. Microfilms Internat, 1983.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.