1. AICPA, 2001a. Statement on auditing standards (SAS) no. 70.
2. AICPA, 2001b. SysTrust? Principles and Criteria.
3. AICPA, 2001c. WebTrust Program: Availability, Principles and Criteria.
4. ASPIC, 2001. A guide to the ASP delivery model ASPIC. In: Application Service Provider Buyer Guide.
5. Boriz, E., Mackler, E., McPhie, D., 1999. Introducing SysTrust, a new assurance service: reporting on systems reliability.