Speck, G. (1969). Breeds and half-breeds ([1st ed.].). C. N. Potter; distributed by Crown Publishers.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSpeck, Gordon. Breeds and Half-breeds. [1st ed.]. New York: C. N. Potter; distributed by Crown Publishers, 1969.
एमएलए (8वां संस्करण) प्रशस्ति पत्रSpeck, Gordon. Breeds and Half-breeds. [1st ed.]. C. N. Potter; distributed by Crown Publishers, 1969.
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