1964Frequency Dictionary of Spanish Words. The Hague: Mouton.
Goethals, Michaël
2003 “E.E.T.: The European English Teaching Vocabulary List”. Practical Applications in Language and Computers, ed. by Barbara Lewandowska-Tomaszczyk, 417–427. Frankfurt: Peter Lang.
Leech, Geoffrey
1997 “Teaching and Language Corpora: A Convergence”. Teaching and Language Corpora, ed. by Anne Wichmann, Steven Fligelstone, Tony McEnery & Gerry Knowles, 1–23. London: Longman.
Sinclair, John M. & Antoinette Renouf
1988 “A Lexical Syllabus for Language Learning”. Vocabulary and Language Teaching, ed. by Ronald Carter & Michael McCarthy, 140–158. London: Longman.