Beckley, W. L. (1997). Creating a classroom portfolio system: A guide to assist classroom teachers in kindergarten through eigth grade. Kendall, Hunt.
Chicago-Zitierstil (17. Ausg.)Beckley, William L. Creating a Classroom Portfolio System: A Guide to Assist Classroom Teachers in Kindergarten Through Eigth Grade. Dubuque, Iowa: Kendall, Hunt, 1997.
MLA-Zitierstil (9. Ausg.)Beckley, William L. Creating a Classroom Portfolio System: A Guide to Assist Classroom Teachers in Kindergarten Through Eigth Grade. Kendall, Hunt, 1997.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.