Klein Ernest. (1966). A comprehensive etymological dictionary of the English language: Dealing with the origin of words and their sense development thus illustrating the history of civilization and culture Vol. I A-K. Elsevier.

Klein Ernest. A Comprehensive Etymological Dictionary of the English Language: Dealing with the Origin of Words and Their Sense Development Thus Illustrating the History of Civilization and Culture Vol. I A-K. Elsevier, 1966.