Johnson, J. D. (1976). Use of groups in schools: A practical manual for everyone who works in elementary and secondary schools. University Press of America.
Chicago-Zitierstil (17. Ausg.)Johnson, Joy Duvall. Use of Groups in Schools: A Practical Manual for Everyone Who Works in Elementary and Secondary Schools. Washington: University Press of America, 1976.
MLA-Zitierstil (9. Ausg.)Johnson, Joy Duvall. Use of Groups in Schools: A Practical Manual for Everyone Who Works in Elementary and Secondary Schools. University Press of America, 1976.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.