Four Types

Lean Enterprise Institute Inc.

Four Types of Problems (English Edition)        

Vermilion

Surrounded by Idiots: The Four Types of Human Behaviour (or, How to Understand Those Who Cannot Be Understood)

CreateSpace Independent Publishing Platform

The Four People Types: And what drives them      

Kailash

Die 4 Happiness-Typen: Wie Erwartungen unsere Glücksfähigkeit prägen

Macmillan USA

Surrounded by Idiots Revised & Expanded Edition: The Four Types of Human Behavior and How to Effectively Communicate with Each in Business (and in Life)

CREATESPACE

The Four Types of Dogs Every Business Needs: How To Build the Right Team To Grow Your Business and Have A Balanced Life

Two Roads

The Four Tendencies: The Indispensable Personality Profiles That Reveal How to Make Your Life Better (and Other People's Lives Better, Too)

The Four Types of Narcissism: Understanding the Narcissistic Personality Disorder and Introducing Revolutionary Ways for Extraordinary Emotional Abuse Recovery (English Edition)

Independently published

The Four Types of Human Behavior: How to Master Communication with Difficult People

Independently published

Parenting as a Type Four: Tools for Parenting with Clarity, Compassion, and Confidence (The Aligned Parent)