^Zgusta, Ladislav. Dolezal, Fredric F.M. , 编. Lexicography then and now. 2006: 202. ISBN 3484391294. A minor... problem can arise when the canonical form of the headword, i.e. the form in which it is to be cited, is to be chosen.
^Francis, W.N.; Kučera, H. Frequency Analysis of English Usage: Lexicon and Usage. Boston: Houghton Mifflin. 1982 (英语).