Henry M. Hoenigswald, „Greek“, The Indo-European Languages, ed. Anna Giacalone Ramat and Paolo Ramat (Routledge, 1998 pp. 228 – 260), p. 228. BBC: Languages across Europe: Greek
B. Joseph (2001): „Ancient Greek“. In: J. Garry et al. (eds.) Facts about the World's Major Languages: An Encyclopedia of the World's Major Languages, Past and Present. (Online PaperАрхив на оригинала от 2016-10-01 в Wayback Machine.)
uci.edu
tlg.uci.edu
N. Nicholas (1999), The Story of Pu: The Grammaticalisation in Space and Time of a Modern Greek Complementiser. PhD Disseration, University of Melbourne. p. 482f. (PDFАрхив на оригинала от 2004-12-06 в Wayback Machine.)
web.archive.org
B. Joseph (2001): „Ancient Greek“. In: J. Garry et al. (eds.) Facts about the World's Major Languages: An Encyclopedia of the World's Major Languages, Past and Present. (Online PaperАрхив на оригинала от 2016-10-01 в Wayback Machine.)
N. Nicholas (1999), The Story of Pu: The Grammaticalisation in Space and Time of a Modern Greek Complementiser. PhD Disseration, University of Melbourne. p. 482f. (PDFАрхив на оригинала от 2004-12-06 в Wayback Machine.)
