Well, see here on the Book of Enoch. Enoch also states in section 7:1-4 (in a section of the Book of Enoch dated to about 250 B.C.) that the "giants" mentioned in Genesis 6:4 were 300 cubits (or about 450 feet, though I think I read somewhere that an Egyptian manuscripts makes it more like 40 feet). And simply being quoted, referenced or alluded to does not itself establish something as Scripture. The Book of Jasher is mentioned in Joshua 10:12-13. And as "Got questions" also informs us,
There are other Hebrew works that are mentioned in the Bible that God directed the authors to use. Some of these include the Book of the Wars of the Lord (Numbers 21:14), the Book of Samuel the Seer, the Book of Nathan the Prophet, and the Book of Gad the Seer (1 Chronicles 29:29). Also, there are the Acts of Rehoboam and the Chronicles of the Kings of Judah (1 Kings 14:29). Paul included a quotation from the Cretan poet Epimenides (Titus 1:12) and quoted from the poets Epimenides and Aratus in his speech at Athens (Acts 17:28).
Also, besides many contrived claims of references to apocryphal books there are some that can be called references, but none are referred to as "Scripture,' or even "it is written," "God/Moses said" which only refer to books of the Hebrew canon. And Enoch it is not called Scripture, unlike "beginning at Moses and all the prophets, he expounded unto them in all the scriptures the things concerning himself," (Luke 24:27) "which were written in the law of Moses, and in the prophets, and in the psalms, concerning me. (Luke 24:44) And he said unto them, These are the words which I spake unto you, while I was yet with you, that all things must be fulfilled, which were written in the law of Moses, and in the prophets, and in the psalms, concerning me. Then opened he their understanding, that they might understand the scriptures, (Luke 24:44,45) Which weighs in favor of a Palestinian canon thought to be held by those who sat in the seat of Moses, who never contended with the Lord about what He referred to as "Scripture," "it is written," "God/Moses said."
Not persuasive. In all other instances where scripture references non-scriptural sources it is merely to confirm some factual assertion. Jude declares the prophesy of Enoch as authoritative.