New York; Hill and Wang, 1963. Harold Rosenthal & John Warrack, The Concise Oxford Dictionary of Opera (second edition). London; Oxford University Press, 1980. Michael Scott, The Record Of Singing (volume one). London; Duckworth, 1977. Klaus Ulrich Spiegel: "Primat für Gesangskunst - Der epochale Wagnersänger Anton van Rooy" - Edition HAfG Acoustucs Hamburg 2014 1870 births 1932 deaths 20th-century Dutch male opera singers Operatic baritones Musicians from Rotterdam