Não informado. (1973). ASTM Standardization News. American Society for Testing and Materials.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. ASTM Standardization News. Philadelphia, Pa: American Society for Testing and Materials, 1973.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. ASTM Standardization News. American Society for Testing and Materials, 1973.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.