Welchons, A. M. (1944). Solid Geometry: A Self-Teaching Course. Ginn.
Cita Chicago Style (17a ed.)Welchons, A. M. Solid Geometry: A Self-Teaching Course. Washington: Ginn, 1944.
Cita MLA (9a ed.)Welchons, A. M. Solid Geometry: A Self-Teaching Course. Ginn, 1944.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.