Kremp, G. O. W. 1., & Kawasaki, T. (1972). Addenda to the spores of the pteridophytes: Illustrations of the spores of the fern and fern allies : a guide to the type species of the extant genera of the Pteridophytes, and to selected extinct spore genera. Tokyo: Hirokawa Publishing Company.
Chicago Style CitationKremp, Gerhard Otto Wilhelm 1913-1994, and Tsugio Kawasaki. Addenda to the Spores of the Pteridophytes: Illustrations of the Spores of the Fern and Fern Allies : A Guide to the Type Species of the Extant Genera of the Pteridophytes, and to Selected Extinct Spore Genera. Tokyo: Hirokawa Publishing Company, 1972.
MLA CitationKremp, Gerhard Otto Wilhelm 1913-1994, and Tsugio Kawasaki. Addenda to the Spores of the Pteridophytes: Illustrations of the Spores of the Fern and Fern Allies : A Guide to the Type Species of the Extant Genera of the Pteridophytes, and to Selected Extinct Spore Genera. Tokyo: Hirokawa Publishing Company, 1972.