Enzer, S. (1969). Some commercial and industrial aspects of the space program. Institute for the Future.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रEnzer, Selwyn. Some Commercial and Industrial Aspects of the Space Program. Middletown, Conn.: Institute for the Future, 1969.
एमएलए (8वां संस्करण) प्रशस्ति पत्रEnzer, Selwyn. Some Commercial and Industrial Aspects of the Space Program. Institute for the Future, 1969.
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