Maryland. Dept. of Economic Development. (1967). Directory of Maryland manufacturers. s.n.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रMaryland. Dept. of Economic Development. Directory of Maryland Manufacturers. Annapolis, etc: s.n, 1967.
एमएलए (9वां संस्करण) प्रशस्ति पत्रMaryland. Dept. of Economic Development. Directory of Maryland Manufacturers. s.n, 1967.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.