Pigford, D., & .Baur, G. R. (1990). Expert systems for business: Concepts and applications : featuring VP-Expert. Boyd & Fraser Pub. Co..
Чикаго-гийн эшлэл (17 дахь хэвлэлт)Pigford, Darleen, ба Gregory R. .Baur. Expert Systems for Business: Concepts and Applications : Featuring VP-Expert. Boston: Boyd & Fraser Pub. Co., 1990.
MLA -ийн эшлэл (9 дэх хэвлэлт)Pigford, Darleen, ба Gregory R. .Baur. Expert Systems for Business: Concepts and Applications : Featuring VP-Expert. Boyd & Fraser Pub. Co., 1990.