Full Idea
Anaximander was the first to produce a philosophical book (later conventionally titled 'On Nature'), if not the first to produce a book at all.
Gist of Idea
Anaximander produced the first philosophy book (and maybe the first book)
Source
report of Anaximander (fragments/reports [c.570 BCE]) by István Bodnár - Anaximander
Book Reference
'Encyclopedia of Classical Philosophy', ed/tr. Zeyl,Donald J. [Fitzroy Dearborn 1997], p.31
A Reaction
Wow! Presumably there were Egyptian 'books', but this still sounds like a stupendous claim to fame.