Dyfyniad APA
Organisation for Economic Co-operation and Development. (1993). Portugal: 1992-1993. OECD Publishing.
Dyfyniad Arddull Chicago
Organisation for Economic Co-operation and Development. Portugal: 1992-1993. Paris: OECD Publishing, 1993.
Dyfyniad MLA
Organisation for Economic Co-operation and Development. Portugal: 1992-1993. OECD Publishing, 1993.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.