Van Vactor, L. G. (1981). Four decades of American educators in Mindanao and Sulu. Dansalan Research Center, Dansalan Junior College.
Lua i Stíl Chicago (17ú heag.)Van Vactor, Lloyd G. Four Decades of American Educators in Mindanao and Sulu. Marawi City: Dansalan Research Center, Dansalan Junior College, 1981.
Lua MLA (9ú heag.)Van Vactor, Lloyd G. Four Decades of American Educators in Mindanao and Sulu. Dansalan Research Center, Dansalan Junior College, 1981.
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