(Q2468158)
Statements
1 reference
2 references
2 April 1930
2 references
18 December 2010
2 references
Identifiers
1 reference
14 November 2017
Sitelinks
Wikipedia(3 entries)
- enwiki Ulbo de Sitter (sociologist)
- frwiki Ulbo de Sitter (sociologue)
- nlwiki Ulbo de Sitter (bedrijfskundige)