Leland, Evelyn F. (1920). "MF Series, 1920 | HOLLIS for". Project Phaedra: Preserving Harvard's Early Data and Research in Astronomy Harvard College Observatory Observations. 64: 1014. Bibcode:1920phae.proj.1014L. Retrieved 2023-05-28.
Leland, Evelyn F. (1920). "MF Series, 1920 | HOLLIS for". Project Phaedra: Preserving Harvard's Early Data and Research in Astronomy Harvard College Observatory Observations. 64: 1014. Bibcode:1920phae.proj.1014L. Retrieved 2023-05-28.