APA (7th ed.) Citation

Leech, G. N., Rayson, P., & Wilson, A. (2001). Word frequencies in written and spoken English: Based on the British National Corpus. Longman.

Chicago Style (17th ed.) Citation

Leech, Geoffrey N., Paul Rayson, and Andrew Wilson. Word Frequencies in Written and Spoken English: Based on the British National Corpus. Harlow: Longman, 2001.

MLA (8th ed.) Citation

Leech, Geoffrey N., et al. Word Frequencies in Written and Spoken English: Based on the British National Corpus. Longman, 2001.