Verbatim text: Fassett, N. C. 1953. North American Ceratophyllum. Comun. Inst. Trop. Invest. Ci. Univ. El Salvador 2: 25-45.
Author: Fassett, N.C.
Year: 1953
Title: North American Ceratophyllum
Journal: Comun. Inst. Trop. Invest. Ci. Univ. El Salvador
Volume: 2
Pages: 25–45