APA (7th ed.) Citation

Christ, H. I., & Tressler, J. C. (1978). Modern English in action: [Level 7-12]. Heath.

Chicago Style (17th ed.) Citation

Christ, Henry I., and Jacob Cloyd Tressler. Modern English in Action: [Level 7-12]. Lexington, Mass.: Heath, 1978.

MLA (9th ed.) Citation

Christ, Henry I., and Jacob Cloyd Tressler. Modern English in Action: [Level 7-12]. Heath, 1978.