:::::::::, thank you for your contributions. In addition to your information, there are (finally!) new sources by , as requested. However he did again the mistake to confuse my talk page for this article's talkpage, so, let me copy-paste Rolandi's findings here: 
 1. https://books.google.al/books?id=-7dq8mi0DWkC&pg;=PA38&dq;=5+million+albanians+in+turkey&hl;=en&sa;=X&ved;=0CBsQ6AEwAGoVChMIhafcnqLfxgIVzGkUCh0FIgPJ#v=onepage&q;=5%20million%20albanians%20in%20turkey&f;=false 
 2. https://books.google.al/books?id=vM5hZEsdz94C&pg;=PA98&dq;=5+million+albanians+in+turkey&hl;=en&sa;=X&ved;=0CCEQ6AEwAWoVChMI3M_xuaXfxgIVgVkUCh1fTQRg#v=onepage&q;=5%20million%20albanians%20in%20turkey&f;=false 
 3.http://www.kohajone.com/index.php/english/genci-mucaj-albania-enjoys-magnificent-relations-with-turkey 
 One of the sources, however, can not be cited, as it notes that the vast majority of the population has been assimilated into the Turkish society. So if any sources are eligible, these are the other two.