Armstrong, D. G. (1977). Record keeping for individualized instructional programs. National Education Association.
Chicago-Zitierstil (17. Ausg.)Armstrong, David G. Record Keeping for Individualized Instructional Programs. Washington, D.C: National Education Association, 1977.
MLA-Zitierstil (9. Ausg.)Armstrong, David G. Record Keeping for Individualized Instructional Programs. National Education Association, 1977.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.