Skelton, R. (1975). Maps a historical survey of their study and collecting. The University of Chicago Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSkelton, R.A. Maps a Historical Survey of Their Study and Collecting. The University of Chicago Press, 1975.
एमएलए (9वां संस्करण) प्रशस्ति पत्रSkelton, R.A. Maps a Historical Survey of Their Study and Collecting. The University of Chicago Press, 1975.
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