v.1: A Practical English grammar A.J. Thopmson, A.V. Martinet, 4th ed, 1986. v.2: The Oxford spelling dictionary Compiled by R.E.Alten, 1986.v.3: A Dictionary of modern English Usage by H.W.Fowler,2nd ed,1965
English language -- Usage -- Dictionaries
English language -- Orthography and spelling -- Dictionaries