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Dyfyniad Arddull ChicagoCantú-Martínez, Pedro César. Sustainable Knowledge-based Economy. 2017.
Dyfyniad MLACantú-Martínez, Pedro César. Sustainable Knowledge-based Economy. 2017.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.