Cita APA (7a ed.)
Mellgren, L., & Walker, M. (1974). New horizons in english: Teachers guide 5. Addison-Wesley.
Cita Chicago Style (17a ed.)
Mellgren, Lars, y Michael Walker. New Horizons in English: Teachers Guide 5. Estados Unidos: Addison-Wesley, 1974.
Cita MLA (9a ed.)
Mellgren, Lars, y Michael Walker. New Horizons in English: Teachers Guide 5. Addison-Wesley, 1974.
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