Beil, D. H. (1985). Symphony first!: An introduction to business software. Reston Computer Group Book.
Chicago-viite (17. p.)Beil, Donald H. Symphony First!: An Introduction to Business Software. Reston, Va: Reston Computer Group Book, 1985.
MLA-viite (9. p.)Beil, Donald H. Symphony First!: An Introduction to Business Software. Reston Computer Group Book, 1985.
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