Jacobson, P. B., & Reavis, W. C. (1942). Duties of school principals. Prentice-Hall, inc.
Lua i Stíl Chicago (17ú heag.)Jacobson, Paul Benjamin, agus William Claude Reavis. Duties of School Principals. New York: Prentice-Hall, inc, 1942.
Lua MLA (9ú heag.)Jacobson, Paul Benjamin, agus William Claude Reavis. Duties of School Principals. Prentice-Hall, inc, 1942.
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