Verbatim text: Palmer, E. J. 1960. Crataegus. Key to series and species. In: R. A. Vines. 1960. Trees, Shrubs, and Woody Vines of the Southwest. Austin. Pp. 329–334.
Author: Palmer, E.J.
Year: 1960
Title: Crataegus. Key to series and species
Editor: Vines, R.A.
Book year: 1960
Book title: Trees, Shrubs, and Woody Vines of the Southwest
Pages: 329–334