Digital Equipment Corporation. (1989). Systems and options catalogue {Catalogue}: Summer/Autumn 1989 (European edition.). European Field Communications Group.
Παραπομπή σε μορφή Chicago (17η εκδ.)Digital Equipment Corporation. Systems and Options Catalogue {Catalogue}: Summer/Autumn 1989. European edition. Reading: European Field Communications Group, 1989.
Παραπομπή σε μορφή MLA (8th εκδ.)Digital Equipment Corporation. Systems and Options Catalogue {Catalogue}: Summer/Autumn 1989. European edition. European Field Communications Group, 1989.
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