Welchons, A. M. (1944). Solid Geometry: A Self-Teaching Course. Ginn.
Chicago-čujuhus (17. p.)Welchons, A. M. Solid Geometry: A Self-Teaching Course. Washington: Ginn, 1944.
MLA-čujuhus (9. p.)Welchons, A. M. Solid Geometry: A Self-Teaching Course. Ginn, 1944.
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