T. with STEVEN ERLANGER. http://ezproxy.library.wwu.edu/login?url=http://proquest.umi.com/pqdweb?did=118091979&Fmt=7&clientId=9320&RQT=309&VName=PQD, (May 2002)
T. PURDUM, and D. SANGER. http://ezproxy.library.wwu.edu/login?url=http://proquest.umi.com/pqdweb?did=117623725&Fmt=7&clientId=9320&RQT=309&VName=PQD, (May 2002)