1
Cyhoeddwyd: 1999-
2
Cyhoeddwyd: 1970-1990;, 1992-2009;, 1970-
3
Cyhoeddwyd: [2019]
Superior document: Title is part of eBook package: De Gruyter DGBA History <1990
Links: Cael y testun llawn; Cael y testun llawn; Cover
4
Cyhoeddwyd: [2011]
Superior document: Title is part of eBook package: De Gruyter DGBA History 1990 - 1999
Links: Cael y testun llawn; Cael y testun llawn; Cover
5
Cyhoeddwyd: [2010]
Superior document: Title is part of eBook package: De Gruyter DGBA Library Information Science 1990 - 1999
Links: Cael y testun llawn; Cael y testun llawn; Cover
6
Cyhoeddwyd: [2010]
Superior document: Title is part of eBook package: De Gruyter DGBA History 1990 - 1999
Links: Cael y testun llawn; Cael y testun llawn; Cover