1
Cyhoeddwyd: 2008.
2
Cyhoeddwyd: [2012]
Superior document: Title is part of eBook package: De Gruyter Gorgias Press Backlist eBook-Package 2001-2013
Links: Cael y testun llawn; Cael y testun llawn; Cover
3
Cyhoeddwyd: [2013]
Superior document: Title is part of eBook package: De Gruyter Gorgias Press Backlist eBook-Package 2001-2013
Links: Cael y testun llawn; Cael y testun llawn; Cover
4
Cyhoeddwyd: [2020]
Superior document: Title is part of eBook package: De Gruyter DG Ebook Package English 2020
Links: Cael y testun llawn; Cael y testun llawn; Cover