Cita APA (7a ed.)

Wardhaugh, R. (1976). English around the world: Level 3: Teacher`s guide. (2a. ed.). Scott, Foresman and Company.

Cita Chicago Style (17a ed.)

Wardhaugh, Ronald. English Around the World: Level 3: Teacher`s Guide. 2a. ed. Estados Unidos: Scott, Foresman and Company, 1976.

Cita MLA (9a ed.)

Wardhaugh, Ronald. English Around the World: Level 3: Teacher`s Guide. 2a. ed. Scott, Foresman and Company, 1976.