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Ronald Wardhaugh , An introduction to sociolinguistics . 5th ed. Oxford 2, languages, dialects and varieties; 3, pidgins and creoles; 4, codes; 5, speech communities; 6, 7, and 8, variation and change; 9, words and culture; 10, ethnographies; 11, solidarity and politeness; 12, talk and action; 13, gender; 14, disadvantage; 15, planning; 16, conclusion. The coverage of sociolinguistic subjects is broad: multilingualism and its consequences, regional and social dialectology.
Peter Bakker (Mon,) studied this question.