APA-viite (7. p.)

Keppel, L. O. (1930). An era of martyrs. Catholic Truth Society.

Chicago-viite (17. p.)

Keppel, Leopoldina Olivia. An Era of Martyrs. London: Catholic Truth Society, 1930.

MLA-viite (8. p.)

Keppel, Leopoldina Olivia. An Era of Martyrs. Catholic Truth Society, 1930.