There is no widely available, complete, and legally sold PDF of the entire 11th or 12th edition in Turkish published by Pearson (the original publisher). However, there are notable nuances:
Boylestad's Electronic Devices Overview | PDF | Silicon - Scribd Electronic Devices And Circuit Theory Turkce Pdf
Some Turkish universities have open-access course materials that follow Boylestad’s chapter structure exactly. These are in Turkish, free, and legal. There is no widely available, complete, and legally
Many websites that host "Turkce Pdf" versions of popular textbooks are filled with malicious ads, fake download buttons, and actual viruses. A student searching for a circuit theory PDF could easily end up installing ransomware or a keylogger. There is no widely available