(1990). Linguaphone Intermediate English Course Programmes 1-10. Linguaphone Institute Limited.
Cita Chicago Style (17a ed.)Linguaphone Intermediate English Course Programmes 1-10. Linguaphone Institute Limited, 1990.
Cita MLA (8a ed.)Linguaphone Intermediate English Course Programmes 1-10. Linguaphone Institute Limited, 1990.
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