General Histories:

Arnold, “History of Rhode Island.”

Staples, “Annals of Providence.”

Greene, “Providence Plantations for 250 Years.”

Richman, “Rhode Island, Its Making and its Meaning.”

Evolution of Soul-liberty:

King, “Religious Liberty.”

Ivimey, “History of English Baptists.”

General Baptist Church Histories, by Benedict, Armitage, Newman, Cathcart, Vedder, etc.

Mullins, “Axioms of Religion.”