I'm sorry; I was lazy.  Here's where I got the information about the diphthongal variants  of , and they make it clear in the references that Wells (1982a) is Wells, J.C. Accents of English 1: An Introduction.  Cambridge: Cambridge University Press.  They also say Cruttenden (2001) is Cruttenden, A. (2001) Gimson's Pronunciation of English. 6th edn. London: Arnold.  A Handbook of Varieties of English (Bernd Kortmann, Edgar W. Schneider, Walter de Gruyter, 2004) is where I got the information about  monophthongization in Cockney; they, in turn, referenced Wells (1982).  In this case, "Wells (1982: 309)" refers to Wells, J.C. Accents of English 2  The British Isles. Cambridge: Cambridge University Press.  There you go.