Bucky wrote more than twenty books over the course of his career (see Bibliography). Several of these books, including Synergetics I and II are available online at bfi.org and other sites.
Online Resources

Synergetics 1 and 2
Synergetics, according to E. J. Applewhite, was Fuller's name for the geometry he advanced based on the patterns of energy that he saw in nature. For Fuller, geometry was a laboratory science with the touch and feel of physical models--not rules out of a textbook. It gains its validity not from classic abstractions but from the results of individual physical experience.

Tensegrity
Portfolio and Art News Annual, No. 4, 1961

Some Perspectives of Fuller's Mathematics
William R. Morrell

A Fuller Explanation
Amy Edmondson
Amy Edmondson clarifies Buckminster Fuller's synergetic geometry in conventional language and mathematics and illuminates his effort to employ synergetics as a strategy for human survival. Updated author Preface and new Foreword by J. Baldwin.

A Practical Guide to Tensegrity Design
Robert Burkhardt
A Practical Guide to Tensegrity Design
Robert William Burkhardt Jr.