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Dyfyniad Arddull Chicagostanley Lesse. Anxiety: Its Components , Development and Treatment. Greene & stratton, 1970.
Dyfyniad MLAstanley Lesse. Anxiety: Its Components , Development and Treatment. Greene & stratton, 1970.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.