Valley, J. R. (1977). Career education of adults. National Advisory Council for Career Education.
Chicago-Zitierstil (17. Ausg.)Valley, John R. Career Education of Adults. Washington: National Advisory Council for Career Education, 1977.
MLA-Zitierstil (9. Ausg.)Valley, John R. Career Education of Adults. National Advisory Council for Career Education, 1977.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.