|←Author Index: Ca||Pope Callixtus I
|Pope from 217 to 222.|
Works about Callixtus I 
- “Pope Callistus I,” in Catholic Encyclopedia, 1913.
- “Callistus, pope” in A Dictionary of Christian Biography and Literature, 1911.
- “Calixtus” in Encyclopædia Britannica, (11th ed.), 1911.
|Works by this author published before January 1, 1923 are in the public domain worldwide because the author died at least 100 years ago. Translations or editions published later may be copyrighted. Posthumous works may be copyrighted based on how long they have been published in certain countries and areas.|