APA (7th ed.) Citation

Ecroyd, D. H., Halfond, M. M., & Towne, C. C. (1966). Voice and articulation: Programmed instruction. Scott, Foresman.

Chicago Style (17th ed.) Citation

Ecroyd, Donald H., Murray M. Halfond, and Carol Chworowsky Towne. Voice and Articulation: Programmed Instruction. Glenview, Ill.: Scott, Foresman, 1966.

MLA (9th ed.) Citation

Ecroyd, Donald H., et al. Voice and Articulation: Programmed Instruction. Scott, Foresman, 1966.