His The life of George Frederick Handel, 1883 t.p. (W.S. Rockstro)
LC in OCLC, 9/3/91 (hdg.: Rockstro, William Smyth, 1823-1895; usage: W.S. Rockstro)
Grove music online, November 19, 2013 (Rockstro (Rackstraw), W(illiam) S(mith) (Smyth); born January 5, 1823, North Cheam, Surrey, died July 2, 1895, London; English music historian, composer, teacher, and pianist; baptized at Morden church in the name of Rackstraw, he used an older form of his surname from 1846)