1
Cyhoeddwyd: 2005.
Superior document: LEA's communication series
Links: Cael y testun llawn
2
Cyhoeddwyd: [2017]
Superior document: Title is part of eBook package: De Gruyter DG Plus DeG Package 2017 Part 1
Links: Cael y testun llawn; Cael y testun llawn; Cover
3
Cyhoeddwyd: [2015]
Superior document: Title is part of eBook package: De Gruyter DG Plus DeG Package 2015 Part 1
Links: Cael y testun llawn; Cael y testun llawn; Cover