(1981). Directory information service. Nr. 2. Entries 5645 - 6194. A periodic supplement to the 1st ed. of the Directory of directories. Inf. Enterprises.
Citácia podle Chicago (17th ed.)Directory Information Service. Nr. 2. Entries 5645 - 6194. A Periodic Supplement to the 1st Ed. of the Directory of Directories. Detroit: Inf. Enterprises, 1981.
Citácia podľa MLA (8th ed.)Directory Information Service. Nr. 2. Entries 5645 - 6194. A Periodic Supplement to the 1st Ed. of the Directory of Directories. Inf. Enterprises, 1981.
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