Harris, Michael H.: History of Libraries in Western World. 4th Edition, s. 94. The Scarecrow Press, 1999. Teoksen verkkoversio. (englanniksi) "Of the Greek classics known today, at least 75 % are known through Byzantine copies. "
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Harris, Michael H.: History of Libraries in Western World. 4th Edition, s. 75–78. The Scarecrow Press, 1999. Teoksen verkkoversio. (englanniksi)