Citazione Stile APA (7a Edizione)

Ubben, G. C., & Hughes, L. W. (1997). The principal: Creative leadership for effective schools (3rd ed.). [Allyn and Bacon].

Citazione stile Chigago Style (17a edizione)

Ubben, Gerald C., e Larry W. Hughes. The Principal: Creative Leadership for Effective Schools. 3rd ed. [Boston]: [Allyn and Bacon], 1997.

Citatione MLA (9a ed.)

Ubben, Gerald C., e Larry W. Hughes. The Principal: Creative Leadership for Effective Schools. 3rd ed. [Allyn and Bacon], 1997.