Hughes, L. W., & Ubben, G. C. (1994). The elementary principal's handbook: A guide to effective action (4th ed.). Allyn and Bacon.
Chicago-viite (17. p.)Hughes, Larry W., ja Gerald C. Ubben. The Elementary Principal's Handbook: A Guide to Effective Action. 4th ed. Boston: Allyn and Bacon, 1994.
MLA-viite (9. p.)Hughes, Larry W., ja Gerald C. Ubben. The Elementary Principal's Handbook: A Guide to Effective Action. 4th ed. Allyn and Bacon, 1994.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.