1
Cyhoeddwyd: [2020];, [1924]
Superior document: Title is part of eBook package: De Gruyter DGBA Reference Works <1990
2
Cyhoeddwyd: [2021]
Superior document: Title is part of eBook package: De Gruyter DGBA Social Sciences - <1990
Links: Cael y testun llawn; Cael y testun llawn; Cover
3
Cyhoeddwyd: [2021]
Superior document: Title is part of eBook package: De Gruyter DGBA Social Sciences 1990 - 1999
Links: Cael y testun llawn; Cael y testun llawn; Cover
4
Cyhoeddwyd: [2021]
Superior document: Title is part of eBook package: De Gruyter DGBA Social Sciences - <1990
Links: Cael y testun llawn; Cael y testun llawn; Cover
5
Cyhoeddwyd: [2022]
Links: Cael y testun llawn; Cael y testun llawn; Cover
6
Cyhoeddwyd: [2022]
Superior document: Title is part of eBook package: De Gruyter DGBA Social Sciences - <1990
Links: Cael y testun llawn; Cael y testun llawn; Cover