Levinson, S. C., & Wittenburg, P. Language as cultural heritage: A project idea / Stephen C. Levinson. Peter Wittenburg. Echo : an infrastructure to bring European cultural heritage online ; the foundation papers of a European initiative.(2002).
Lua i Stíl Chicago (17ú heag.)Levinson, Stephen C., agus Peter Wittenburg. "Language as Cultural Heritage: A Project Idea / Stephen C. Levinson. Peter Wittenburg." Echo : An Infrastructure to Bring European Cultural Heritage Online ; the Foundation Papers of a European Initiative.(2002) .
Lua MLA (8ú heag.)Levinson, Stephen C., agus Peter Wittenburg. "Language as Cultural Heritage: A Project Idea / Stephen C. Levinson. Peter Wittenburg." Echo : An Infrastructure to Bring European Cultural Heritage Online ; the Foundation Papers of a European Initiative.(2002), .