Verbatim text: Spongberg, S. A. 1976. Magnoliaceae hardy in temperate North America. J. Arnold Arbor. 57: 250-312.
Author: Spongberg, S.A.
Year: 1976
Title: Magnoliaceae hardy in temperate North America
Journal: J. Arnold Arbor
Volume: 57
Pages: 250–312
BHL link: http://www.biodiversitylibrary.org/part/28167