Use your knowledge of how to build a thesaurus to arrange the following terms in a thesaurus structure. Be guided by the order below:
Authorized Term/ Unauthorized term
Topical Term
Broader Term
Narrower Term
Related Term.

(Information retrieval, indexing, index, searching, author index, book index, critical abstracts, summary, computer databases, structured abstracts, source databases, abstracts, text-numeric databases, abstracting, full-text databases, referral databases, bibliographic databases, catalogue databases, UG catalogue)