Não informado. (1915). Annals of the Dearborn Observatory of the Northwestern University. Dearborn Observatory of the Northwestern University.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. Annals of the Dearborn Observatory of the Northwestern University. Evanston, Ill: Dearborn Observatory of the Northwestern University, 1915.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. Annals of the Dearborn Observatory of the Northwestern University. Dearborn Observatory of the Northwestern University, 1915.
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