History of the Philharmonic society of London 1813-1912: A record of a hundred years' work in the cause of music, page 228 "London Premiere of Hiller's Im Freien".
Accesat în 22 octombrie 2011.  ^ History of the Philharmonic society of London 1813-1912: A record of a hundred years' work in the cause of music, page 228 ^ „London Premiere of Hiller's Im Freien”.