Westminster John Knox Press. 2001. Liddell, Henry George; Robert Scott. AGreek–EnglishLexicon: κατάπυγον. Oxford University Press (via Perseus Project). 1940
Robert Scott, AGreek-EnglishLexicon, on Perseus λόγος (页面存档备份,存于互联网档案馆), Henry George Liddell, Robert Scott, AGreek-EnglishLexicon, on Perseus μετρολογία