Não informado. (2002). Principal Leadership. National Association of Secondary School Principals.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Principal Leadership. Reston, Va: National Association of Secondary School Principals, 2002.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Principal Leadership. National Association of Secondary School Principals, 2002.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.