Friedman, P., & O'Brien, J. A. (1978). Their brothers' keepers: [the Christian heroes and heroines who helped the oppressed escape the Nazi terror] / by Philip Friedman. Forew. by John A. O'Brien. Holocaust Library.

Friedman, Philip, and John A. O'Brien. Their Brothers' Keepers: [the Christian Heroes and Heroines Who Helped the Oppressed Escape the Nazi Terror] / by Philip Friedman. Forew. by John A. O'Brien. New York: Holocaust Library, 1978.

Friedman, Philip, and John A. O'Brien. Their Brothers' Keepers: [the Christian Heroes and Heroines Who Helped the Oppressed Escape the Nazi Terror] / by Philip Friedman. Forew. by John A. O'Brien. Holocaust Library, 1978.