E. C. Pickering, Lydia Hinchman, Harlow Shapley and the Beginning of Graduate Work at the Harvard College ObservatoryDOI: info:10.1016/0364-9229(86)90004-7v. 5No. 19157–171
Kidwell, Peggy Aldrich. 1986. "E. C. Pickering, Lydia Hinchman, Harlow Shapley and the Beginning of Graduate Work at the Harvard College Observatory." Astronomy Quarterly, 5, (19) 157–171. https://doi.org/10.1016/0364-9229(86)90004-7.