Psychosynthesis
A Collection of Basic Writings a.k.a. A Manual of Principles and
Techniques
by Roberto Assagioli
Psychosynthesis: A Collection of Basic Writings outlines many of the fundamental principles and techniques of Psychosynthesis. Roberto Assagioli was the founder of Psychosynthesis, so while there are other, more easy to follow and use books on Psychosynthesis, this one remains a classic and provides a overview of Psychosynthesis and it's origins.
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The Act of Will
A Guide to Self-Actualisation and Self-Realistion
by Roberto Assagioli
The Act of Will: A Guide to Self-Actualisation and Self-Realisation outlines what Roberto Assagioli saw as being one of the most important aspects of the psyche, and one of particular importance to Psychosynthesis - The Will.
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Transpersonal Development
The Dimension Beyond Psychosynthesis
by Roberto Assagioli
Produced 13 years after the author's death, Transpersonal Development: The Dimension Beyond Psychosynthesis is a collection of writings by Roberto Assagioli which were originally notes, essays, speeches and lectures. The writings contain practical guidelines for anyone undertaking the task of self-knowledge and self-realization.