Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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