Britannica Encyclopedia, 11th Edition, Volume 3, page 365 – Baptism was changed from the name of Jesus to words Father, Son & Holy Ghost in 2nd Century.
Canney Encyclopedia of Religion, page 53 – The early church baptized in the name of the Lord Jesus until the second century.
Hastings Encyclopedia of Religion, Volume 2 – Christian baptism was administered using the words, "in the name of Jesus." page 377. Baptism was always in the name of Jesus until time of Justin Martyr, page 389.
Catholic Encyclopedia, Volume 2, page 263 – Here the authors acknowledged that the baptismal formula was changed by their church.
Schaff – Herzog Religious Encyclopedia, Volume 1, page 435 – The New Testament knows only the baptism in the name of Jesus.
Hastings Dictionary of Bible, page 88 – It must be acknowledged that the three fold name of Matthew 28:19 does not appear to have been used by the primitive church, but rather in the name of Jesus, Jesus Christ or Lord Jesus.