Παραπομπή σε μορφή APA (7η εκδ.)

Abell, A. I. The Catholic factor in urban welfare: The early period, 1850-1880. [publisher not identified].

Παραπομπή σε μορφή Chicago (17η εκδ.)

Abell, Aaron Ignatius. The Catholic Factor in Urban Welfare: The Early Period, 1850-1880. [Place of publication not identified]: [publisher not identified].

Παραπομπή σε μορφή MLA (8th εκδ.)

Abell, Aaron Ignatius. The Catholic Factor in Urban Welfare: The Early Period, 1850-1880. [publisher not identified].