Aleksandra Newskiego w Sofii Allan Kozinn: Boris Christoff, Bass, Dies at 79; Esteemed for His BorisGodunov. [w:] The New York Times [on-line]. 29 czerwca
Musorgski: "Tsarevicha skorey" Godunov's death scene from Act IV of BorisGodunov 7:18 9. Wagner: "Wehe, wehe mir der Qual" Amfortas' and Titurel's scene