Langdon, D. G. (1978). The audio-workbook. Educational Technology Publications.
Cita Chicago Style (17a ed.)Langdon, Danny G. The Audio-workbook. Englewood Cliffs, N.J.: Educational Technology Publications, 1978.
Cita MLA (8a ed.)Langdon, Danny G. The Audio-workbook. Educational Technology Publications, 1978.
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