Não informado. (1915). Annals of the Dearborn Observatory of the Northwestern University. Dearborn Observatory of the Northwestern University.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Annals of the Dearborn Observatory of the Northwestern University. Evanston, Ill: Dearborn Observatory of the Northwestern University, 1915.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Annals of the Dearborn Observatory of the Northwestern University. Dearborn Observatory of the Northwestern University, 1915.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.