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He wants to remember on his own, without using the reference book.
Like reference books, they have to be used rather than read.
What is a good reference book about his life and work?
You would have to own 50 reference books to get what's in this one book.
Perhaps it is too new to appear in reference books.
It's the world's best reference book for a car guy.
They form a good reference book for anyone who is interested.
Reference books are available in the Library for the students.
No need to pool tax money to buy reference books.
At the library, we would have found information in some children's reference book or another.
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