Ball, O. M. (1931). A contribution to the paleobotany of the Eocene of Texas. Agricultural and Mechanical College of Texas.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBall, Oscar Melville. A Contribution to the Paleobotany of the Eocene of Texas. College Station: Agricultural and Mechanical College of Texas, 1931.
एमएलए (8वां संस्करण) प्रशस्ति पत्रBall, Oscar Melville. A Contribution to the Paleobotany of the Eocene of Texas. Agricultural and Mechanical College of Texas, 1931.
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