1
Cyhoeddwyd: 2012.
2
Cyhoeddwyd: 2005.
3
Cyhoeddwyd: [2002]
Superior document: Title is part of eBook package: De Gruyter New York University Press Backlist eBook-Package 2000-2013
Links: Cael y testun llawn; Cael y testun llawn; Cover
4
Cyhoeddwyd: [2004]
Superior document: Title is part of eBook package: De Gruyter Rutgers University Press Backlist eBook-Package 2000-2013
Links: Cael y testun llawn; Cael y testun llawn; Cover