Schnell W J. (1971). Thirty years a watchtower slave (Abridged ed.). Baker House.
Chicago-čujuhus (17. p.)Schnell W J. Thirty Years a Watchtower Slave. Abridged ed. Michigan: Baker House, 1971.
MLA-čujuhus (9. p.)Schnell W J. Thirty Years a Watchtower Slave. Abridged ed. Baker House, 1971.
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