Heinegg, Paul (2010). "Jeffery-Johnson". Free African Americans of Virginia, North Carolina, South Carolina, Maryland and Delaware. Retrieved March 7, 2011., See Preface by Ira Berlin as well. Note: The historian Ira Berlin suggests that early Africans in the colony may have been Atlantic creoles, bilingual and mixed-race descendants of Portuguese or Spanish workers and African women. That may also have been the case for John Casor, whose surname was recorded in colonial records as Cazara and Corsala in 1672 and 1676, respectively.
