APA (7th ed.) Citation

Lamb, C., Lamb, M., & Green, W. (1970). Poetry for children. Books for Libraries Press.

Chicago Style (17th ed.) Citation

Lamb, Charles, Mary Lamb, and Winifred Green. Poetry for Children. Freeport, N.Y.: Books for Libraries Press, 1970.

MLA (9th ed.) Citation

Lamb, Charles, et al. Poetry for Children. Books for Libraries Press, 1970.