Walker, Alan (1986). "Liszt and Agnes Street-Klindworth: A Spy in the Court of Weimar ?". Studia Musicologica Academiae Scientiarum Hungaricae. 28 (1/4). Akadémiai Kiadó: 47–63. JSTOR902409. OCLC180654184.
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Walker, Alan (1986). "Liszt and Agnes Street-Klindworth: A Spy in the Court of Weimar ?". Studia Musicologica Academiae Scientiarum Hungaricae. 28 (1/4). Akadémiai Kiadó: 47–63. JSTOR902409. OCLC180654184.