Nation, Paul, and Robert Waring. 1997. Vocabulary size, text coverage and word lists. Vocabulary: Description, acquisition and pedagogy, 6-19. Archived 2013-07-15 at the Wayback Machine
Nation, Paul, and Robert Waring. 1997. Vocabulary size, text coverage and word lists. Vocabulary: Description, acquisition and pedagogy, 6-19. Archived 2013-07-15 at the Wayback Machine