[Lurking2Long]

Who put those books INTO the canon?

[Stubborn]

They were always there but the early councils of the church in 393 held at Hippo affirmed the use of the Apocryphal books as Scripture.

In response to Protestant views, the Roman Catholic Church made its position clear at the Council of Trent (1546) when it dogmatically affirmed that the entire Latin Vulgate enjoyed equal canonical status.

Likewise, Hebrews, James, 2 Peter, 2 & 3 John, Jude, and Revelation are the Deuterocanonical books of the New Testament.

Like Pyro7480 said, look there.