Johnson, A. (1959). A student's guide to the ferns of Singapore island. University of Malaya Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रJohnson, Anne. A Student's Guide to the Ferns of Singapore Island. Singapore: University of Malaya Press, 1959.
एमएलए (9वां संस्करण) प्रशस्ति पत्रJohnson, Anne. A Student's Guide to the Ferns of Singapore Island. University of Malaya Press, 1959.
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