Crystal, D. The past, present, and future of world Englisch: David Crystal. Globalization and the future of German : with a select bibliography.(2004).
Chicago-viite (17. p.)Crystal, David. "The Past, Present, and Future of World Englisch: David Crystal." Globalization and the Future of German : With a Select Bibliography.(2004) .
MLA-viite (8. p.)Crystal, David. "The Past, Present, and Future of World Englisch: David Crystal." Globalization and the Future of German : With a Select Bibliography.(2004), .
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.