D. Kirkpatrick. http://ezproxy.library.wwu.edu/login?url=http://proquest.umi.com/pqdweb?did=117808701&Fmt=7&clientId=9320&RQT=309&VName=PQD, (May 2002)
B. WEINRAUB, and A. BUSCH. http://ezproxy.library.wwu.edu/login?url=http://proquest.umi.com/pqdweb?did=117880426&Fmt=7&clientId=9320&RQT=309&VName=PQD, (May 2002)