Verbatim text: Catling, P. M. and K. B. Gregg. 1992. Systematics of the genus Cleistes in North America. Lindleyana 7: 57–73.
Author: Catling, P.M., Gregg, K.B.
Year: 1992
Title: Systematics of the genus Cleistes in North America
Journal: Lindleyana
Volume: 7
Pages: 57–73