Schrefer, E., & Barber, N. (2015). Immortal guardians: Spirit animals: fall of the beasts series, book 1 (Unabridged.). Scholastic Audio.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSchrefer, Eliot, और Nicola Barber. Immortal Guardians: Spirit Animals: Fall of the Beasts Series, Book 1. Unabridged. New York City: Scholastic Audio, 2015.
एमएलए (8वां संस्करण) प्रशस्ति पत्रSchrefer, Eliot, और Nicola Barber. Immortal Guardians: Spirit Animals: Fall of the Beasts Series, Book 1. Unabridged. Scholastic Audio, 2015.
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