- Enneagram Philosophy Triads
- Detailed Instinctual Stackings by Type
- Karen Horney’s Three Trends (Moving Towards, Against, Away From) and the Enneagram Styles by by Jerome Wagner, Ph.D.
- Karen Horney and the Enneagram by Katherine Chernick Fauvre
- A Study Of The Enneagram Instinctual Subtypes by Katherine Chernick Fauvre
- David Daniels: The Enneagram Personality Types in Relationships — Intimacy and Compatibility: The 45 Combinations of Enneagram Relationships
- David Daniels: Working with the Enneagram Harmony Triads, A Key to Development and Integration
- The Enneagram in Business: Enneagram Theory: The Enneagram Arrows as a Dynamic Convergence
- A Directional Theory of the Enneagram
- The Enneagram Tritype
Each person is not only differentiated by their main type (9 possibilities), their wing (9×2=18 possibilities), their dominant instinctual variant (18×3=54), the stacking of the instinctual variants (54×2=108), but also their preferred types in each Centre – the tritype (108×18=1,944 possibilities). 1,944 different kinds of people – this is hardly stereotyping. - Why some of us don’t have one true calling, TED Talk by Emilie Wapnick (a description of successful 7s)
- The Sexual Instinct is the Death Instinct
- Enneagram Subtype Combinations in Relationships
- Enneagram with Type-Color Associations
- Childhood Scenarios for Enneatypes: Law of Three
- Instinct Stacking Face Composites Updated