Obiols, A., & Subi. (2012). Triceratops: The strongest dinosaur (1st ed. for the United States and Canada.). Barron's Educational Series.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रObiols, Anna, और Subi. Triceratops: The Strongest Dinosaur. 1st ed. for the United States and Canada. Hauppage, NY: Barron's Educational Series, 2012.
एमएलए (8वां संस्करण) प्रशस्ति पत्रObiols, Anna, और Subi. Triceratops: The Strongest Dinosaur. 1st ed. for the United States and Canada. Barron's Educational Series, 2012.
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