APA (7th ed.) Citation
(1992). BBC Keys to Business English + 1 audio cassette. BBC English.
Chicago Style (17th ed.) Citation
BBC Keys to Business English + 1 Audio Cassette. London: BBC English, 1992.
MLA (9th ed.) Citation
BBC Keys to Business English + 1 Audio Cassette. BBC English, 1992.
Warning: These citations may not always be 100% accurate.