Cita APA (7a ed.)

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.