Notes on tulip species - Dykes, William Rickatson, 1877-1925.; Dykes, Elsie Katherine; Hall, A. Daniel (London : H. Jenkins, ltd., 1930)
"The late W.R. Dykes. Biographical note by Mrs. W.R. Dykes" : p. 13-15.
Bibliography: p. 9-10.
Keywords: Tulips