by Special to The New York Times
Published in The New York times (15.08.1989)

by Carnahan, James E
Year of Publication 01.08.1974

by Selzer, M L, Vinokur, A, Wilson, T D
Published in Journal of studies on alcohol (01.07.1977)

by Allen, Rand L, Laughlin, Alexander M
Published in Contract management (01.02.2005)

by Kadlec, Daniel
Published in USA today (Arlington, Va.) (01.11.1994)

by Zack, Margaret, Staff Writer
Published in Star Tribune (25.08.1991)

Published in USA today (Arlington, Va.) (06.12.1996)

by By Wayne E. Green and Wade Lambert
Published in The Wall Street journal. Eastern edition (31.07.1989)

by Anderson, Dave
Published in The New York times (26.03.1989)

by By Ron Cook. Scripps Howard News Service
Published in Newsday (04.01.1987)

by By Ford Fessenden and Joshua Quittner
Published in Newsday (06.02.1989)