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Dyfyniad Arddull ChicagoOld, Fraser. Inventions, Patents, Brands & Designs: The How, What, When, Where & Why of Intellectual Property Protection. Killara, N.S.W: Patent Press, 1993.
Dyfyniad MLAOld, Fraser. Inventions, Patents, Brands & Designs: The How, What, When, Where & Why of Intellectual Property Protection. Patent Press, 1993.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.