APA (7th ed.) Citation

Ecroyd, D. H., Halfond, M. M., & Towne, C. C. Voice and articulation: Recorded exercises. Scott, Foresman.

Chicago Style (17th ed.) Citation

Ecroyd, Donald H., Murray M. Halfond, and Carol Chworowsky Towne. Voice and Articulation: Recorded Exercises. Glenview, Ill.: Scott, Foresman.

MLA (9th ed.) Citation

Ecroyd, Donald H., et al. Voice and Articulation: Recorded Exercises. Scott, Foresman.