1
Cyhoeddwyd: 2019.
Superior document: American Crossroads Series ; v.55
2
Cyhoeddwyd: 2004.
3
Cyhoeddwyd: [2018]
Superior document: Title is part of eBook package: De Gruyter DG Plus eBook-Package 2018
Links: Cael y testun llawn; Cael y testun llawn; Cover
4
Cyhoeddwyd: [2010]
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