Rigge, W. F. (1924). The graphic construction of eclipses and occultations. Loyola University Press.
Chicago-viite (17. p.)Rigge, William F. The Graphic Construction of Eclipses and Occultations. Chicago, Ill.: Loyola University Press, 1924.
MLA-viite (8. p.)Rigge, William F. The Graphic Construction of Eclipses and Occultations. Loyola University Press, 1924.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.