The age of martyrs :
Christianity from Diocletian to Constantine /
Giuseppe Ricciotti ; Translated by Anthony Bull.

APA Citation

Ricciotti, G. (1992). The age of martyrs: Christianity from Diocletian to Constantine. New York: Barnes & Noble.

MLA Citation

Ricciotti, Giuseppe, 1890-1964. The Age of Martyrs: Christianity From Diocletian to Constantine. New York: Barnes & Noble, 1992.

Warning: These citations may not always be complete (especially for serials).