1. American Association for Public Opinion Research Web Site. Refer to numerous documents on how to design and conduct interviews. http://www.aapor.com
2. The use of answering machines and caller ID to regulate home privacy;Crabb;Environ. Behav.,1999
3. Mail and Telephone Surveys: The Total Design Method;Dillman,1978
4. Mail and Internet Surveys: The Tailored Design Method;Dillman,2000
5. Race-of-interviewer effects in a preelection poll: Virginia 1989;Finkel;Public Opin. Q.,1991