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References
- ↑ "C/1890 V1 (Zona) – JPL Small-Body Database Lookup". ssd.jpl.nasa.gov. Jet Propulsion Laboratory . Retrieved 7 November 2024.
- ↑ G. W. Kronk (2003). Cometography: A Catalog of Comets. Vol. 2: 1800–1899. Cambridge University Press. pp. 658–660. ISBN 978-0-521-58505-7.
- ↑ T. Zona (1891). "Osservazioni della Cometa 1890 IV (Zona Nov. 15)" (PDF). Astronomische Nachrichten (in Italian). 126 (9): 141–142. Bibcode:1891AN....126..141Z. doi: 10.1002/asna.18911260907 .
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