APA (7th ed.) Citation

Williams, K., Boone, L. P., & Englebert, M. (1964). Spelling is fun. American Southern.

Chicago Style (17th ed.) Citation

Williams, Katie, Lalia Phipps Boone, and Merle Englebert. Spelling Is Fun. Montgomery, Alabama: American Southern, 1964.

MLA (8th ed.) Citation

Williams, Katie, et al. Spelling Is Fun. American Southern, 1964.