Khullar, S. P Ferms of Nainital/ S. P Khullar - 1st ed. - Dehra Dun: Bishen Singh, 1991. - 234 p. ISBN: 8121100623 Subjects--Topical Terms: Ferns -- India -- Naini Tal -- Classification.Ferns -- India -- Naini Tal -- Identification.Ferns. Dewey Class. No.: 587.31 / KHU/F