They are sources from which to draw practical information about identification and availability. They provide lists of telephone numbers and addresses of people and organizations that can be contacted for the research. They are published annually and for this reason they are generally called yearbooks.
- Annuario generale italiano (Roma, Milano, Guida Monaci)
- Guida delle regioni d'Italia (Roma, Sispr)
- Aida (Milano, Bureau Van Dijk, Cd-Rom edizione & diffusione, Novcredit, c1994- )
- Amadeus (Bureau Van Dijk).