APA (7th ed.) Citation

(1979). Directory of on-line information resources (3. ed.). CSG Pr.

Chicago Style (17th ed.) Citation

Directory of On-line Information Resources. 3. ed. Rockville, Maryland: CSG Pr, 1979.

MLA (9th ed.) Citation

Directory of On-line Information Resources. 3. ed. CSG Pr, 1979.