"The American Heritage Dictionary of the English Language: Fourth Edition: Appendix I: Indo-European Roots". 2000. Diarkibkan daripada yang asal pada 2008-06-25. Dicapai pada 2013-06-07. Cite journal requires |journal= (bantuan); |contribution= ignored (bantuan)
books.google.com
The surface science of metal oxides, by Victor E. Henrich, P. A. Cox, page 28, google books link
κρύος, Henry George Liddell, Robert Scott, A Greek-English Lexicon, on Perseus Digital Library
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"The American Heritage Dictionary of the English Language: Fourth Edition: Appendix I: Indo-European Roots". 2000. Diarkibkan daripada yang asal pada 2008-06-25. Dicapai pada 2013-06-07. Cite journal requires |journal= (bantuan); |contribution= ignored (bantuan)
