"According to the review published in the New York Times, the encore was sung a cappella.\r\nEricson, Raymond. \"Music: Irina Arkhipova: Bolshoi Mezzo Excels in Lieder at Carnegie.\" New York Times (1923-), Nov 19 1966, p. 27. ProQuest. Web. 18 Sep. 2024." . "Irina Arkhipova, Mezzo-Soprano" . . . . . . . . . . . . . . . . "solo recital" . . . . "1966-11-18T20:30:00"^^ . . . . .