Spokane Public Schools. Department of Music & Armstrong, R. F. (1951). Organization of the elementary string program: A handbook. Spokane Public Schools.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSpokane Public Schools. Department of Music और Robert F. Armstrong. Organization of the Elementary String Program: A Handbook. Spokane, Wash.: Spokane Public Schools, 1951.
एमएलए (8वां संस्करण) प्रशस्ति पत्रSpokane Public Schools. Department of Music और Robert F. Armstrong. Organization of the Elementary String Program: A Handbook. Spokane Public Schools, 1951.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.