“Guy L. Wilson, Herbert Medalist,” Herbertia, Vol. 13, 1946
“Notes on Daffodil Breeding,” Guy L. Wilson, Herbertia, Vol. 13, 1946
“The Daffodil in Australia – Some Recent Developments,” Harold Alston
“Commercial Breeding of Daffodils,” Frank Reinelt
“Production of New Narcissus,” E.C. Powell; “A Few Narcissus Crosses,” C.W. Culpepper
“Narcissus Breeding by an Amateur,” W.R. Ballard
“Experiences in Breeding Narcissus,” J.S. Cooley
“Narcissus Diseases,” Charles J. Gould
“Insect and Mite Pests of Narcissus,” E.P. Breakey
“Maintaining Soil Fertility for Narcissus,” J.S. Cooley
“Narcissus for the Subtropics,” Wyndham Hayward
“Narcissus Culture in Northwest Texas,” Willie May Kell
“Garden Culture of Narcissus in Florida,” John V. Watkins