Silverberg, R. (2018). Time and time again: Sixteen trips in time. Three Rooms Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSilverberg, Robert. Time and Time Again: Sixteen Trips in Time. New York, NY: Three Rooms Press, 2018.
एमएलए (8वां संस्करण) प्रशस्ति पत्रSilverberg, Robert. Time and Time Again: Sixteen Trips in Time. Three Rooms Press, 2018.
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