The dates beside a word indicate the earliest year for which there is a surviving written record of that word (in English, unless otherwise indicated). The basic sources of this work are Weekley's "An Etymological Dictionary of Modern English," Klein's "A Comprehensive Etymological Dictionary of the English Language," "Oxford English Dictionary" (second edition), "Barnhart Dictionary of Etymology," Holthauzen's "Etymologisches Wörterbuch der Englischen Sprache," Ayto's "20th Century Words," and Chapman's "Dictionary of American Slang." A full list of sources used in this compilation can be found here.

　　網站：http://www.etymonline.com/

　　此網站介紹普遍字根的字，以表格方式列出，清楚明瞭方便查詢。

　　網站：http://academic.cuesta.edu/acasupp/AS/506.HTM

　　此網站列出常見的字首、字尾，提供老師、學生們查詢。

　　網站：http://www.learnenglish.de/grammar/suffixtext.htm