Ludendorff, M. (1954). The origin and nature of the soul. Hohe Warte.
Chicago-čujuhus (17. p.)Ludendorff, Mathilde. The Origin and Nature of the Soul. Pähl: Hohe Warte, 1954.
MLA-čujuhus (9. p.)Ludendorff, Mathilde. The Origin and Nature of the Soul. Hohe Warte, 1954.
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