Keller, H. (2007). Help!: A story of friendship. Greenwillow Books.
Cita Chicago Style (17a ed.)Keller, Holly. Help!: A Story of Friendship. [New York, N.Y.]: Greenwillow Books, 2007.
Cita MLA (8a ed.)Keller, Holly. Help!: A Story of Friendship. Greenwillow Books, 2007.
Precaución: Estas citas no son 100% exactas.