(1981). Directory information service. Nr. 3. Entries 6195 - 6753. A periodic supplement to the 1st ed. of Directory of directories. Inf. Enterprises.
Chicago-Zitierstil (17. Ausg.)Directory Information Service. Nr. 3. Entries 6195 - 6753. A Periodic Supplement to the 1st Ed. of Directory of Directories. Detroit: Inf. Enterprises, 1981.
MLA-Zitierstil (9. Ausg.)Directory Information Service. Nr. 3. Entries 6195 - 6753. A Periodic Supplement to the 1st Ed. of Directory of Directories. Inf. Enterprises, 1981.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.