Covington, G. A., & Hannah, B. (1997). Access by design. Van Nostrand Reinhold.
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Dyfyniad Arddull Chicago
Covington, George A., and Bruce Hannah. Access by Design. New York: Van Nostrand Reinhold, 1997.
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Dyfyniad MLA
Covington, George A., and Bruce Hannah. Access by Design. Van Nostrand Reinhold, 1997.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.