Here is a list of books that will help you build your OD library and learn the various practices and methods used by OD practitioners today.
Argyris, C., and D.A. Schön. (1996). Organizational Learning II. Reading, MA: Addison-Wesley.
Beckhard, R., and R.T. Harris. (1977). Organizational Transitions: Managing Complex Change. Reading, MA: Addison-Wesley.
Bennis, W.G. (1969). Organization Development: Its Nature, Origins, and Prospects. Reading, MA: Addison-Wesley.
Berger, P.L., and T. Luckman. (1966). The Social Construction of Reality. New York: Anchor Books.
Block, P. (1999). Flawless Consulting: A Guide to Getting Your Expertise Used. San Francisco: Pfeiffer.
Boone, L.E., and D.D. Bowen. (1987). The Great Writings ...