APA (7th ed.) Citation

Mackey, W. F., & Mackey, W. F. (1967). Bilingualism as a world problem. Harvest House.

Chicago Style (17th ed.) Citation

Mackey, William Francis, and William Francis Mackey. Bilingualism as a World Problem. Montreal: Harvest House, 1967.

MLA (9th ed.) Citation

Mackey, William Francis, and William Francis Mackey. Bilingualism as a World Problem. Harvest House, 1967.