1
Cyhoeddwyd: [2011]
Superior document: Title is part of eBook package: De Gruyter Penn Press eBook Package Complete Collection
2
Cyhoeddwyd: c2011.
3
Cyhoeddwyd: 2006.
Links: Cael y testun llawn
4
Cyhoeddwyd: [2017]
Superior document: Title is part of eBook package: De Gruyter PUP eBook-Package Pilot Project 2017
Links: Cael y testun llawn; Cover
5
Cyhoeddwyd: [2019]
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