1
Cyhoeddwyd: 2001.
2
Cyhoeddwyd: [1990]
Superior document: Title is part of eBook package: De Gruyter New York University Press Archive eBook-Package Pre-2000
Links: Cael y testun llawn; Cover
3
Cyhoeddwyd: [2013]
Superior document: Title is part of eBook package: De Gruyter HUP e-dition: Complete eBook Package
Links: Cael y testun llawn; Cael y testun llawn; Cover