Leech, G., Rayson, P., & Wilson, A. (2001). Word frequencies in written and spoken English : based on the British National Corpus / Geoffrey Leech, Paul Rayson, Andrew Wilson: Based on the British National Corpus. Longman.
Chicago Style (17th ed.) CitationLeech, Geoffrey, Paul Rayson, and Andrew Wilson. Word Frequencies in Written and Spoken English : Based on the British National Corpus / Geoffrey Leech, Paul Rayson, Andrew Wilson: Based on the British National Corpus. Harlow: Longman, 2001.
MLA (9th ed.) CitationLeech, Geoffrey, et al. Word Frequencies in Written and Spoken English : Based on the British National Corpus / Geoffrey Leech, Paul Rayson, Andrew Wilson: Based on the British National Corpus. Longman, 2001.
Warning: These citations may not always be 100% accurate.