APA (7th ed.) Citation

Guth, H. P., & Schuster, E. H. (1977). American English today: Teacher's manual and answer key (2d ed., rev.). Webster Division/McGraw Hill.

Chicago Style (17th ed.) Citation

Guth, Hans Paul, and Edgar Howard Schuster. American English Today: Teacher's Manual and Answer Key. 2d ed., rev. New York: Webster Division/McGraw Hill, 1977.

MLA (9th ed.) Citation

Guth, Hans Paul, and Edgar Howard Schuster. American English Today: Teacher's Manual and Answer Key. 2d ed., rev. Webster Division/McGraw Hill, 1977.