Severin, T. (1997). The spice islands voyage: The quest for alfred wallace, the man who shared darwin's discovery of evolution p. AUWSF.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSeverin, Tim. The Spice Islands Voyage: The Quest for Alfred Wallace, the Man Who Shared Darwin's Discovery of Evolution P. New York: AUWSF, 1997.
एमएलए (9वां संस्करण) प्रशस्ति पत्रSeverin, Tim. The Spice Islands Voyage: The Quest for Alfred Wallace, the Man Who Shared Darwin's Discovery of Evolution P. AUWSF, 1997.
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