Dirven Rene Dirven & Fried Vilem Fried 
Functionalism in Linguistics [PDF ebook] 

This volume offers a variety of viewpoints on the functional approach to the study of language. After an exposition of the Prague School functionalism, and Dik’s and Halliday’s functional approaches, it presents a wider area of text-linguistic, psycholinguistic, sociolinguistic, theoretical, descriptive and applied issues from a functional point of view, testifying of the very wide-spread and in-depth impact of functionalist thought on the present-day linguistic scene.