You can purchase digital versions or access material through the official Fono Yayınları Website
The curriculum is divided into stages, such as the "Hızlı İngilizce" (Fast English) series, which includes First, Second, Third, and Fourth steps. Audio Resources: fono ingilizce egitim seti pdf
Dijital Dünyada "Fono İngilizce Eğitim Seti PDF" Arayışı You can purchase digital versions or access material