1
Cyhoeddwyd: c2011.
2
Cyhoeddwyd: c1996.
Links: Cael y testun llawn
3
Cyhoeddwyd: [2009]
Superior document: Title is part of eBook package: De Gruyter PUP eBook-Package 2000-2015
Links: Cael y testun llawn; Cover
4
Cyhoeddwyd: [2000]
Superior document: Title is part of eBook package: De Gruyter Central European University Press eBook-Package 2013-1998
Links: Cael y testun llawn; Cover
5
Cyhoeddwyd: [2022]
Superior document: Title is part of eBook package: De Gruyter Central European University Press eBook-Package 2013-1998
Links: Cael y testun llawn; Cael y testun llawn; Cover