Ehrlich, Eugene H.The Highly Selective Dictionary for the Extraordinarily Literate. HarperCollins, 1997. This companion volume to the Highly Selective Thesaurus for the Extraordinarily Literate focuses on the most confusing and misused words in the language, relating the finer points of sense and meaning.
Chantrell, Glynnis, ed.The Oxford Dictionary of Word Histories. Oxford University Press, 2002. Describes the origins of over 11,000 words in the English language.
Hoad, T. F., ed.The Concise Oxford Dictionary of English Etymology. Oxford University Press, 1986, 1993. Based on the authoritative unabridged edition (1966), this paperback edition retains the historical approach.