物の本

もののほん【物の本】

book related to the subject〖C〗その事柄に関係のある本; technical book 〖C〗専門書; specific book〖C〗.

¶～によると…である

It says in some book that...

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もののほん【物の本】

a book; some book or other; a written work; something one has read.

●物の本によると according to what I've read somewhere (or other)

・物の本にそう書いてある. It says so in some book or other. | I've read it [seen it written down] somewhere.