Reference:Beetle1944a
Verbatim text: Beetle, D. F. 1944. A monograph of the North American species of Fritillaria. Madroño 7: 133–159.
Author: Beetle, D.F.
Year: 1944
Title: A monograph of the North American species of Fritillaria
Journal: Madroño
Volume: 7
Pages: 133–159