In 1977 Bacchiocchi published From Sabbath to Sunday, documenting the historical transition from the Saturday Sabbath to Sunday in the early Christian church due to social, pagan and political factors, and also the decline of standards for the day [REF].
Bacchiocchi has also been influential in the Worldwide Church of God (and its offshoots), which supported Sabbath-keeping until 1995, and also other Sabbath keeping groups.