Vinal, W. G. (1926). Nature Guiding. Comstock.
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Dyfyniad Arddull Chicago
Vinal, William Gould. Nature Guiding. Ithaca, N.Y.: Comstock, 1926.
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Dyfyniad MLA
Vinal, William Gould. Nature Guiding. Comstock, 1926.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.