Verbatim text: Pennell, F. W. 1933. A revision of Synthyris and Besseya. Proc. Acad. Nat. Sci. Philadelphia 85: 77–106.
Author: Pennell, F.W.
Year: 1933
Title: A revision of Synthyris and Besseya
Journal: Proc. Acad. Nat. Sci. Philadelphia
Volume: 85
Pages: 77–106