Grant R. Jeffrey (1948 - 2012) was and still is a respected American writer who authored several best-selling books.
"The Signature of God" is one of them.
In this book, he presents the argument that when someone places their signature on something, that's basically "proof" of its authenticity or genuineness. Following that logic, Jeffrey puts forth that we can know that the Bible is God's inspired Word and was written by Him because ... God signed it! Think he can convince you?