List of largest optical refracting telescopes (English Wikipedia)

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Waaland, J. Robert (1967). "Fraunhofer and the Great Dorpat Refractor". American Journal of Physics. 35 (4): 344. Bibcode:1967AmJPh..35..344W. doi:10.1119/1.1974076.

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Caplan, James; Le Guet Tully, Françoise (2008). "2008JHA....39..131C Page 131". Journal for the History of Astronomy. 39 (134): 131. Bibcode:2008JHA....39..131C. doi:10.1177/002182860803900114. S2CID 125660771.