Joanna Blaszczak & Dorota Klimek-Jankowska 
How Categorical are Categories? [PDF ebook] 
New Approaches to the Old Questions of Noun, Verb, and Adjective

This book addresses the foundational question of category distinctions and challenges the traditional views from the modern theoretical and experimental perspective. Its focus is on the noun-verb, noun-adjective distinctions and categories occupying the 'grey zone’ between standard categories (e.g., nominalizations). This book will be of interest for researchers and students of linguistics and cognitive sciences.