Cruz, B. V. (1973). The private secondary school principals in the city and province of Davao: A survey in their personal characteristics and their supervisory functions [microform]. Photoduplication Service.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCruz, Benedicto Vizcarra. The Private Secondary School Principals in the City and Province of Davao: A Survey in Their Personal Characteristics and Their Supervisory Functions [microform]. Quezon City: Photoduplication Service, 1973.
एमएलए (9वां संस्करण) प्रशस्ति पत्रCruz, Benedicto Vizcarra. The Private Secondary School Principals in the City and Province of Davao: A Survey in Their Personal Characteristics and Their Supervisory Functions [microform]. Photoduplication Service, 1973.
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