APA (7th ed.) Citation

Helgerson, L. W., & Ennis, M. G. (1988). The CD-ROM sourcebook. Diversified Data Resources, Inc..

Chicago Style (17th ed.) Citation

Helgerson, Linda W., and Martin G. Ennis. The CD-ROM Sourcebook. Falls Church, VA: Diversified Data Resources, Inc., 1988.

MLA (9th ed.) Citation

Helgerson, Linda W., and Martin G. Ennis. The CD-ROM Sourcebook. Diversified Data Resources, Inc., 1988.

Warning: These citations may not always be 100% accurate.