A handbook of varieties of English :
a multimedia reference tool.
APA Citation
Kortmann, B., Schneider, E. W. (Edgar Werner). (2004). A handbook of varieties of English: a multimedia reference tool. Berlin: Mouton de Gruyter.
MLA Citation
Kortmann, Bernd, 1960-, and Edgar W. (Edgar Werner) Schneider. A Handbook of Varieties of English: a Multimedia Reference Tool. Berlin: Mouton de Gruyter, 2004.
Warning: These citations may not always be complete (especially for serials).