1. Chemical Abstracts Service's secondary chemical information services
2. History of Abstracting at Chemical Abstracts Service
3. 1997. “CAS: A spectrum of information for scientists”.CAS Catalog,
4. 1997. “CAS celebrates 90th anniversary”.CAS News Release, April 14
5. 1997. “CAS SciFinder offers first-time-ever point-and-click substructure access to world's largest chemical databases”.CAS News Release, September 7