Ratcliff, Jessica (2016). "Travancore's magnetic crusade: Geomagnetism and the geography of scientific production in a princely state". The British Journal for the History of Science. 49 (3): 325–352. doi:10.1017/S0007087416000340. PMID27324812.
harvard.edu
ui.adsabs.harvard.edu
Caldecott, J. (1846). "Eclipse of the Sun on December 21, 1843, observed at Parratt, three miles North of the Source of the Mahè River". Memoirs of the Royal Astronomical Society. 15: 171. Bibcode:1846MmRAS..15..171C.
Caldecott, J. (1846). "Observations of the Great Comet of 1843, made at the Observatory of Trevandrum". Memoirs of the Royal Astronomical Society. 15: 229–. Bibcode:1846MmRAS..15..229C.
Ratcliff, Jessica (2016). "Travancore's magnetic crusade: Geomagnetism and the geography of scientific production in a princely state". The British Journal for the History of Science. 49 (3): 325–352. doi:10.1017/S0007087416000340. PMID27324812.