APA (7th ed.) Zitazioa
Kimbrough, R. B. (1990). The principalship: Concepts an practices. Prentice-Hall.
Chicago Style (17th ed.) Zitazioa
Kimbrough, Ralph B. The Principalship: Concepts an Practices. New Jersey: Prentice-Hall, 1990.
MLA (9th ed.) Zitazioa
Kimbrough, Ralph B. The Principalship: Concepts an Practices. Prentice-Hall, 1990.
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