Business and economics databases online: Environmental scanning with a personal computer: C. J. Popovich. Libraries Unlimited, Littleton, CO (1987) xviii + 276 pp. $35.00 (U.S.; $42.00 elsewhere). ISBN 0-87287-454-0.
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论文评审过程：Available online 13 July 2002.
论文官网地址：https://doi.org/10.1016/0306-4573(88)90114-8
