Sahni, M. R., and V. V. Sastri, 1957, A monograph of the Orbitolines found in the Indian continent (Chitral, Gilgit, Kashmir), Tibet and Burma with observations on the age of the associated volcanic series, Memoirs of the Geological Survey of lndia, Delhi, n. ser. 33(3):1-44.
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Sahni, M. R., and V. V. Sastri, 1957, A monograph of the Orbitolines found in the Indian continent (Chitral, Gilgit, Kashmir), Tibet and Burma with observations on the age of the associated volcanic series, Memoirs of the Geological Survey of lndia, Delhi, n. ser. 33(3):1-44.