Analysis of information sources in references of the Wikipedia article "Romantik gitar" in Turkish language version.
[Page showing guitars, the oldest saying "1779 Italy Vinaccia TH Looks right for 1779"; at the bottom of the page TH refers to a linked article "Dr. Heck - Stalking the Earliest 6-String" in which the author Thomas F. Heck concludes " the guitar with six single strings is probably of French or Italian origin, definitely not of Spanish origin...I do not consider the matter closed..."]
...According to the current historical records, Gaetano Vinaccia and his brother Gennaro were responsible for the creation of the first six string guitar sometimes around 1776 in Naples...Authenticity of his surviving guitar was often placed in question by modern historians...
[Page showing guitars, the oldest saying "1779 Italy Vinaccia TH Looks right for 1779"; at the bottom of the page TH refers to a linked article "Dr. Heck - Stalking the Earliest 6-String" in which the author Thomas F. Heck concludes " the guitar with six single strings is probably of French or Italian origin, definitely not of Spanish origin...I do not consider the matter closed..."]
[Page showing guitars, the oldest saying "1779 Italy Vinaccia TH Looks right for 1779"; at the bottom of the page TH refers to a linked article "Dr. Heck - Stalking the Earliest 6-String" in which the author Thomas F. Heck concludes " the guitar with six single strings is probably of French or Italian origin, definitely not of Spanish origin...I do not consider the matter closed..."]
...According to the current historical records, Gaetano Vinaccia and his brother Gennaro were responsible for the creation of the first six string guitar sometimes around 1776 in Naples...Authenticity of his surviving guitar was often placed in question by modern historians...