APA (7th ed.) Citation

Irwin, J. V., Wong, S. P., & Beasley, D. S. (1983). Phonological development in children 18 to 72 months. Southern Illinois University Press.

Chicago Style (17th ed.) Citation

Irwin, John V., Seok P. Wong, and Daniel S. Beasley. Phonological Development in Children 18 to 72 Months. Carbondale: Southern Illinois University Press, 1983.

MLA (8th ed.) Citation

Irwin, John V., et al. Phonological Development in Children 18 to 72 Months. Southern Illinois University Press, 1983.