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Top 5 Project Office Management Books (PMO, P3O)
Portfolio, Programme and Project Offices: P3O (P30)Portfolio, Programme and Project Offices: P3O (P30) by OGC - Office of Government Commerce
Buy new: £36.11
The latest development in project and programme office for years, a very good buy
Managing portfolios of change with MSP for programmes and  PRINCE2 for projects: Integrating MSP and PRINCE2Managing portfolios of change with MSP for programmes and PRINCE2 for projects: Integrating MSP and PRINCE2 by Chris Venning
Buy new: £27.22 / Used from: £24.40
More is needed in the portfolio management office space, watch this space for the release of "Portfolio Management" guidance
Managing successful programmes: Office of Government CommerceManaging successful programmes: Office of Government Commerce by Rod Sowden ... [et al.]
Buy new: £40.37 / Used from: £36.67
If you have a programme office, the MSP book is a must especially for the benefits side
Creating the Project Office: A Manager's Guide to Leading Organizational Change (Jossey-Bass Business & Management)Creating the Project Office: A Manager's Guide to Leading Organizational Change (Jossey-Bass Business & Management) by Randall L. Englund
Buy new: £21.17 / Used from: £16.20
A good book for PMO Managers, if not only for the distinct lack of good books in the area of project offices.
30 Minutes to Plan a Project30 Minutes to Plan a Project by Trevor L. Young
Buy used from: £0.01
Included this on the project office side because this is an excellent book to introduce project support to the science that is project planning!