Parker, W. (1982). Mackinder: Geography as an aid to statecrafts. Clarendon Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रParker, W.H. Mackinder: Geography as an Aid to Statecrafts. Clarendon Press, 1982.
एमएलए (9वां संस्करण) प्रशस्ति पत्रParker, W.H. Mackinder: Geography as an Aid to Statecrafts. Clarendon Press, 1982.
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