by Yang, Ya-Ting C., Newby, Timothy J., Bill, Robert L.
Published in The American journal of distance education (01.09.2005)

by Bill, Robert
Year of Publication 2006

by Bill, Robert L
Published in Journal of veterinary medical education (2007)

by Herbert H. Thompson, Marc Racicot, Robert L. Braun, Bill Edmonds, Janet B. Palmer
Published in The Christian Science monitor (1983) (20.08.1996)

by By Bill Richards and Robert L. Rose
Published in The Wall Street journal. Eastern edition (03.05.1988)

by Robert L. Koenig and Bill Lambrecht Post-Dispatch Washington Bureau
Published in St. Louis post-dispatch (01.11.1992)

by Robert L. Koenig and Bill Lambrecht Post-Dispatch Washington Bureau
Published in St. Louis post-dispatch (01.11.1992)

by Robert L. Koenig and Bill Lambrecht Post-Dispatch Washington Bureau The Associated Press contributed to this story
Published in St. Louis post-dispatch (25.03.1994)

by Robert L. Koenig and Bill Lambrecht Post-Dispatch Washington Bureau The Associated Press contributed to this report
Published in St. Louis post-dispatch (25.03.1994)