Cita APA (7a ed.)
Wardhaugh, R. (1975). English around the world: level 2: Teacher`s guide. (2a. ed.). Scott, Foresman and Company.
Cita Chicago Style (17a ed.)
Wardhaugh, Ronald. English Around the World: Level 2: Teacher`s Guide. 2a. ed. Estados Unidos: Scott, Foresman and Company, 1975.
Cita MLA (9a ed.)
Wardhaugh, Ronald. English Around the World: Level 2: Teacher`s Guide. 2a. ed. Scott, Foresman and Company, 1975.
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