* [http://img.kb.dk/tidsskriftdk/pdf/gto/gto_0065-PDF/gto_0065_71550.pdf Sven Illeris, Per Kongstad og Flemming Larsen: Servicecentre i Midtjylland og teori for servicecentre" (''Geografisk Tidsskrift'', Bind 65; 1966)]
* [http://img.kb.dk/tidsskriftdk/pdf/spso/spso_0007-PDF/spso_0007_95956.pdf P. Nannestad Olsen: "At the Cradle of a Party System: Voting Patterns and Voting Groups in the Danish Constitutional . Convention 1848-1849" (''Scandinavian Political Studies'', Bind 7; 1972)] (engelsk)
* [http://img.kb.dk/tidsskriftdk/pdf/spso/spso_ns_0008-PDF/spso_ns_0008_95482.pdf Johannes T. Pedersen: "The Relationship between Democratic Values and Norms in the Danish Electorate" (''Scandinavian Political Studies'', Bind 8; New Series; 1985)] (engelsk)
* [http://www.utd.edu/~herve/abdi-GuttmanScaling2010-pretty.pdf Hervé Abdi: Guttman Scaling] (engelsk)
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