Oakley, V. (1950). The holy experiment, our heritage from William Penn: Series of mural paintings in the governor's reception room, in the Senate chamber, and in the supreme courtroom of the State Capitol at Harrisburg, Pennsylvania, U.S.A. [Philadelphia: Cogslea Studio Publications.

Oakley, Violet. The Holy Experiment, Our Heritage From William Penn: Series of Mural Paintings in the Governor's Reception Room, in the Senate Chamber, and in the Supreme Courtroom of the State Capitol At Harrisburg, Pennsylvania, U.S.A. [Philadelphia: Cogslea Studio Publications, 1950.

Oakley, Violet. The Holy Experiment, Our Heritage From William Penn: Series of Mural Paintings in the Governor's Reception Room, in the Senate Chamber, and in the Supreme Courtroom of the State Capitol At Harrisburg, Pennsylvania, U.S.A. [Philadelphia: Cogslea Studio Publications, 1950.