Vashishta P., . (1988). Pteridophytes vascular cryptograms vol IV. : S.Chand.
Vashishta P.C, . 1988. Pteridophytes vascular cryptograms vol IV. : S.Chand.
Vashishta P.C, . Pteridophytes vascular cryptograms vol IV. : S.Chand. 1988.