Schubert, W. (1950). Sybellus for evangelism. General Conferencia of S.D.A.
Chicago-čujuhus (17. p.)Schubert, Walter. Sybellus for Evangelism. General Conferencia of S.D.A, 1950.
MLA-čujuhus (9. p.)Schubert, Walter. Sybellus for Evangelism. General Conferencia of S.D.A, 1950.
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