Heber Curtis
1942
/
Heber Doust Curtis, 1872-1942
/ Robert R. McMath / PASP 54 (1942) p. 69 [
lien
]
1976
/
Ritchey, Curtis and the Discovery of Novae in Spiral Nebulae
/ M. A. Hoskin / Journal for the History of Astronomy 7 (1976) p. 47 [
lien
]