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Dyfyniad Arddull ChicagoDr. Franklyn M. Branley. Tornado Alert (Let's-Read-and-Find-Out Science 2). 1. HarperCollins, 1988.
Dyfyniad MLADr. Franklyn M. Branley. Tornado Alert (Let's-Read-and-Find-Out Science 2). 1. HarperCollins, 1988.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.