1982Word Frequencies in British and American English. Bergen: Norwegian Computing Centre for the Humanities.
Johansson, Stig and Knut Hofland
1987Frequency Analysis of English Vocabulary and Grammar. 21 vols. Oxford: Oxford University Press.
Johansson, Stig, Geoffrey Leech and Helen Goodluck
1978Manual of Information to Accompany the Lancaster-Oslo/Bergen Corpus of British English, for Use with Computers. Oslo: Department of English, University of Oslo.
Kučera Henry and W. Nelson Francis
1967Computational Analysis of Present-day American English. Providence: Brown University Press.
Leech, Geoffrey, P. Rayson and Andrew Wilson
2001Word Frequencies in Written and Spoken English. London: Longman-Pearson Education.
Shastri, S. V.
1992 “Opaque and transparent features of Indian English”. In Gerhard Leitner, ed. New Directions in English Language Corpora, Berlin: Mouton de Gruyter, 263–75.
Thorndike, Edward L.
1927The Teacher’s Word Book. 2nd edition. New York: Teacher’s College, Columbia University.
West, Michael
1953A General Service List of English Words. London: Longman.