(1980). The 1980 world book year book (ed.). World book- childcraft international, Inc..
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Dyfyniad Arddull Chicago
The 1980 World Book Year Book. ed. Chicago: World book- childcraft international, Inc., 1980.
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Dyfyniad MLA
The 1980 World Book Year Book. ed. World book- childcraft international, Inc., 1980.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.