“Go ye therefore, and teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost:” Matthew 28:19

The Tyndale New Testament Commentaries, I, 275:

“It is often affirmed that the words in the name of the Father, and of the Son, and of the Holy Ghost are not the ipsissima verba [exact words] of Jesus, but…a later liturgical addition.”

The Catholic Encyclopedia, II, page 263:

“The baptismal formula was changed from the name of Jesus Christ to the words Father, Son, and Holy Spirit by the Catholic Church in the second century.”

The International Standard Bible Encyclopedia, Vol. 4, page 2637, Under “Baptism,” says:

Matthew 28:19 in particular only canonizes a later ecclesiastical situation, that its universalism is contrary to the facts of early Christian history, and its Trinitarian formula (is) foreign to the mouth of Jesus.”

New Revised Standard Version says this about Matthew 28:19:

“Modern critics claim this formula is falsely ascribed to Jesus and that it represents later (Catholic) church tradition, for nowhere in the book of Acts (or any other book of the Bible) is baptism performed with the name of the Trinity…”

The Bible Commentary 1919 page 723:

Dr. Peake makes it clear that: “The command to baptize into the threefold name is a late doctrinal expansion. Instead of the words baptizing them in the name of the Father, and of the Son, and of the Holy Ghost we should probably read simply-”into My Name.”

(Taken from: http://www.apostolic.net/biblicalstudies/matt2819-willis.htm)