1
Cyhoeddwyd: 1997.
Superior document: Philosophie und Wissenschaft, transdisziplinare Studien ; Bd. 13
Links: Cael y testun llawn
2
Cyhoeddwyd: [1970]
Superior document: Title is part of eBook package: De Gruyter University of Pennsylvania Press Package Archive 1898-1999
Links: Cael y testun llawn; Cael y testun llawn; Cover
3
Cyhoeddwyd: [2015]
Superior document: Title is part of eBook package: De Gruyter DGBA Reference Works <1990
Links: Cael y testun llawn; Cael y testun llawn; Cover