Goodricke, John. XXVI. A series of observations on, and a discovery of, the period of the variation of the light of the bright star in the head of medusa, called algol. In a letter from John Goodricke, Esq. to the Rev. Anthony Shepherd, D. D. F. R. S. and Plumian Professor at Cambridge (англ.) // Philosophical Transactions of the Royal Society of London : journal. — 1783. — 1 January (vol. 73). — P. 474—482. — doi:10.1098/rstl.1783.0027.
harvard.edu
ui.adsabs.harvard.edu
Garcia-Sanchez, J.; Preston, R. A.; Jones, D. L.; Lestrade, J.-F.; et al. (25 августа 1997). "A Search for Stars Passing Close to the Sun". The First Results of Hipparcos and Tycho. Kyoto, Japan: IAU. Bibcode:1997IAUJD..14E..51G.