https://media2.intercer.net/lectiuneazs/2014/ss/trim3//st11/st11_introducere.mp3 Gabriel Radu & Liana Sanda; „Introducere in studiul 11”; Lectiune AZS (Audio)
https://media2.intercer.net/lectiuneazs/2014/ss/trim3//st13/st13_introducere.mp3 Gabriel Radu & Liana Sanda; „Introducere in studiul 13”; Lectiune AZS (Audio)