APA (7th ed.) Citation

Winter, J., & Winter, J. (2007). The secret world of Hildegard. A. A. Levine.

Chicago Style (17th ed.) Citation

Winter, Jonah, and Jeanette Winter. The Secret World of Hildegard. New York: A. A. Levine, 2007.

MLA (8th ed.) Citation

Winter, Jonah, and Jeanette Winter. The Secret World of Hildegard. A. A. Levine, 2007.

Warning: These citations may not always be 100% accurate.