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(en) Edward Pigott et Henry C. Englefield, « On the Periodical Changes of Brightness of Two Fixed Stars. By Edward Pigott, Esq. Communicated by Sir Henry C. Englefield, Bart. F. R. S », Philosophical Transactions of the Royal Society of London, vol. 87, , p. 133 (DOI10.1098/rstl.1797.0007, JSTOR106921, Bibcode1797RSPT...87..133P, lire en ligne)
(en) B. W. Bopp et S. B. Howell, « The Remarkable Spectrum of the RV Tauri Star R Souti at Deep Minimum », Bulletin of the American Astronomical Society, vol. 14, , p. 880 (JSTOR40678238, Bibcode1982BAAS...14Q.880B)
(en) Edward Pigott et Henry C. Englefield, « On the Periodical Changes of Brightness of Two Fixed Stars. By Edward Pigott, Esq. Communicated by Sir Henry C. Englefield, Bart. F. R. S », Philosophical Transactions of the Royal Society of London, vol. 87, , p. 133 (DOI10.1098/rstl.1797.0007, JSTOR106921, Bibcode1797RSPT...87..133P, lire en ligne)