Itkonen Esa Itkonen 
Grammatical Theory and Metascience [PDF ebook] 
A critical investigation into the methodological and philosophical foundations of 'autonomous’ linguistics

In this book, the author analyses the nature of the science of grammar. After presenting some methodological and historical background, he sets forth a theory of language and of grammar, showing that the science of grammar is not an empirical, but a normative science, comparable to logic and philosophy, characterized by the use of the method of explication.