ebrary, Inc. (1986). Preservation of historical records. National Academy Press.
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Dyfyniad Arddull Chicago
ebrary, Inc. Preservation of Historical Records. Washington, D.C.: National Academy Press, 1986.
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Dyfyniad MLA
ebrary, Inc. Preservation of Historical Records. National Academy Press, 1986.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.