The International Federation of Accountants's PAO Development Committee publishes various materials for professional accountancy organisations (PAOs). These materials ranges from good guidance books, toolkits, surveys, to reports.
Substantial information and a copy of all published materials can be found at: http://www.ifac.org/about-ifac/professional-accountancy-organization-development-committee/publications-resources
A good source of reference are original publications in the PAO Capacity Building Series. These publications are aimed at helping PAOs fill in gaps in knowledge to enhance their important role within the accountancy profession. Some of the titles in the series include:
The above publications from the PAO Capacity Building Series can be found at: https://www.ifac.org/about-ifac/developing-global-profession/pao-capacity-building-series