APA (7th ed.) Citation

Guth, H. P., & Schuster, E. H. (1970). American English today. Webster Division/McGraw-Hill.

Chicago Style (17th ed.) Citation

Guth, Hans Paul, and Edgar Howard Schuster. American English Today. New York: Webster Division/McGraw-Hill, 1970.

MLA (8th ed.) Citation

Guth, Hans Paul, and Edgar Howard Schuster. American English Today. Webster Division/McGraw-Hill, 1970.