Article Hoffleit, Dorrit (1991)
The evolution of the Henry Draper Memorial. Vistas in Astronomy (pp. 107-162). (/isis/citation/CBB000055541/) unapi

Article Gingerich, Owen (1982)
Henry Draper's scientific legacy. Annals of the New York Academy of Sciences (pp. 308-320). (/isis/citation/CBB000019984/) unapi

Article Plotkin, Howard (1977)
Henry Draper, the discovery of oxygen in the sun, and the dilemma of interpreting the solar spectrum. Journal for the History of Astronomy (pp. 44-51). (/isis/citation/CBB000022089/) unapi