This book is a little dated, but still useful, probably more so for students of English than of Linguistics.
The book covers a variety of methods you can use to analyse language (with particular reference to poems). It describes the standard patterns of sound and metre in poetry such as consonance, assonance, and rhyme, along with the more 'scientific' linguistic aspects such as morphology, semantics, and syntax.
Other topics include the stylistic applications to drama plus an examination of realism, from classic to postmodernism.