reference source(Any publication from which authoritative information can be obtained, including but not limited to reference books, catalog records, printed indexes and abstracting services, and bibliographic databases. Individuals and services outside the library that can be relied upon to provide authoritative information are considered resources for referral. ODLIS Alexander Demidov)
informational power(Early ground based systems were considered to be an informational power assist to ground analysts who made the ultimate decisions relative to line and depot maintenance. Post Scriptum)