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Burghardt, Manuel and Heckner, Markus and Wolff, Christian (2012) The Many Ways of Searching the Web Together : A Comparison of Social Search Engines. In: Lewandowski, Dirk, (ed.) Web Search Engine Research. Library and Information Science, 4. Emerald Group Publishing Limited., Bingley, UK, pp. 1-28. ISBN 978-1-78052-636-2.
Burghardt, Manuel and Heckner, Markus and Wolff, Christian (2011) Social Search. In: Lewandowski, Dirk, (ed.) Handbuch Internet-Suchmaschinen 2: Neue Entwicklungen in der Web-Suche. Akademische Verlagsgesellschaft AKA, Heidelberg. ISBN 978-3898386517.