«Exceptional voice of the bear from Berlin». The Sydney Morning Herald (på engelsk). 25. april 2008. Besøkt 31. august 2020. «THE most-requested artist on ABC Classic FM is not Joan Sutherland or Andrea Bocelli or any other of the usual suspects. It is Ivan Rebroff, the "Russian bear from Berlin", whose voice covered over four octaves, from extremely deep to counter-tenor, almost soprano.»
Hunt, Ken (18. april 2008). «Obituary: Ivan Rebroff». The Guardian (på engelsk). ISSN0261-3077. Besøkt 31. august 2020. «Rebroff employed his extraordinary vocal range - described in the Guinness Books of Records as extending "easily over four octaves from a low F to a high F, one and a quarter octaves above C" - on albums with titles such as Kosaken Müssen Reiten (Cossacks Must Ride, 1970).»
Hunt, Ken (18. april 2008). «Obituary: Ivan Rebroff». The Guardian (på engelsk). ISSN0261-3077. Besøkt 31. august 2020. «Rebroff employed his extraordinary vocal range - described in the Guinness Books of Records as extending "easily over four octaves from a low F to a high F, one and a quarter octaves above C" - on albums with titles such as Kosaken Müssen Reiten (Cossacks Must Ride, 1970).»
