Spergel, B. 2001. Raising Revenues for Protected Areas. Washington, D.C.: WWF Center for Conservation Finance
This paper describes more than 25 different ways of raising revenues for protected areas. It summarizes their relative advantages and disadvantages and lists sources for obtaining further information. It is intended as a practical tool for protected-area managers, finance ministry officials, international donor agencies, and local conservation organizations.
There is a useful explanation of the steps required to set up a conservation trust fund in the appendix.