noun
A book used for reference or citation, such as a dictionary, encyclopedia, or source text.
論文を書くときは、引用書を明記してください。
When writing a paper, please clearly indicate your reference books.
この辞書は日本語学習者にとって良い引用書だ。
This dictionary is a good reference book for Japanese learners.
参考書 is a study aid or supplementary book for learning, whereas 引用書 is a book cited as a source.
Compound of 引用 (citation, quotation) and 書 (book, document).