Here is a selective bibliography containing some publications important for this lecture. You will find a choice of these in my semester apparatus either in the Seminar Library (TB) or in the University Library (UB).
Bauer, L., An Introduction to International Varieties of English (Edinburgh, 2003).
Crystal, D., English as a Global Language (Cambridge, 2003).
Crystal, D., The Cambridge Encyclopedia of the English Language, 2nd ed. (Cambridge, 2003), chapter 20.
Hickey, R., ed., Standards of English: Codified Varieties around the World (Cambridge, 2012). (UB)
Hogg, R., et al., ed., The Cambridge History of the English Language, 6 vols. (Cambridge, 1992-2001), vols. 5 and 6. (vol. 5 TB, vol. 6 UB)
Hughes, A., and P. Trudgill, English Accents and Dialects, 3rd ed. (London and New York, 1996).
Jenkins, J., World Englishes: a Resource Book for Students, 2nd ed. (London, 2009).
Kachru, B. B., Y. Kachru, and C. L. Nelson, ed., The Handbook of World Englishes (Oxford, 2006).
Kirkpatrick, A., ed., The Routledge Handbook of World Englishes (London, 2010).
Kortmann, B., and E. W. Schneider, ed., A Handbook of Varieties of English, 2 vols. and CD-ROM (Berlin and New York, 2004).
Kortmann, B., et al., ed., Varieties of English, 4 vols. and CD-ROM (Oxford, 2008). (UB)
McArthur, T., Oxford Guide to World English (Oxford, 2002). (UB)
Melchers, G., and P. Shaw, World Englishes, 2nd ed. (London, 2011). (UB)
Mesthrie, R., and R. M. Bhatt, R.M., World Englishes (Cambridge, 2008).
Milroy, J., and L. Milroy, L., ed., Real English: The Grammar of English Dialects in the British Isles (London, 1993).
Schneider, E. W., Postcolonial English: Varieties around the World (Cambridge, 2007).
Svartvik, J., and G. Leech, English: One Tongue, Many Voices (Basingstoke, 2006).
Trudgill, P., and J. Hannah, International English: a Guide to the Varieties of Standard English, 5th ed. (London, 2008). (TB)
Trudgill, P., and J. K. Chambers, J. K., Dialects of English: Studies in Grammatical Variation (London, 1991).
Wells, J. C., Accents of English, 3 vols. (Cambridge, 1982).