Staber, E. (1987). Approach to testing and maintaining telephone exchanges and networks. Standard Telephone und Radio AG.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रStaber, E. Approach to Testing and Maintaining Telephone Exchanges and Networks. Zurich, Switzerland: Standard Telephone und Radio AG, 1987.
एमएलए (9वां संस्करण) प्रशस्ति पत्रStaber, E. Approach to Testing and Maintaining Telephone Exchanges and Networks. Standard Telephone und Radio AG, 1987.
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