On the subject of books above....
How was information delivered....
According to the written word.....
Interesting subject...

Audibly { Exod.19:19, Matt.3:17 }
in His own handwritting { Exod. 31:18}
through angels { Luke 2:10-12, Heb 2:2 }
through prophets { Jeremiah 1:5 , Hebrews 1:1 }
through dreams { Dan. 2, Matt. 1:20 }
through visions { Ezek. 1:1 }
through apostles { Acts 1:2 }
through inspiration { 2 Tim. 3:16 }
through revelation { Gal. 1:12, Eph. 3:3 , Rev 1:1 }
through Jesus Christ, the Son of God { Heb.1:2 }