reference book

/R EH1 F ER0 AH0 N S B UH1 K/
noun
  1. 1

    A book providing factual information.

    โ€œThe Red Book is the standard reference book for those naming inorganic chemical compounds.โ€

  2. 2

    (libraries) A book that can be consulted in the library but cannot be borrowed.

    โ€œI wanted to take out the encyclopedia, but the librarian said it was a reference book.โ€

Source: https://en.wiktionary.org/wiki/reference%20book