http://wikiless.i2p/wiki/Tense_(grammar)?lang=en
Oxford: Oxford University Press. pp. 184– 211. ISBN 978-0-19-538197-9 . ^ Hatav, Galia (2012). "Bound tenses". In Binnick, Robert (ed.). The Oxford handbook of tense and aspect . Oxford: Oxford University Press. pp. 611– 637.