Klepper. On the Road with Texas Highways. Texas A&M University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रKlepper. On the Road with Texas Highways. Texas A&M University Press.
एमएलए (9वां संस्करण) प्रशस्ति पत्रKlepper. On the Road with Texas Highways. Texas A&M University Press.
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