H. Larry Ingle (2016). "'Truly Radical, Non-violent, Friendly Approaches': Challenges to the American Friends Service Committee". Quaker History. 105 (Spring): 1–21. doi:10.1353/qkh.2016.0004. S2CID163984864.
H. Larry Ingle (2016). "'Truly Radical, Non-violent, Friendly Approaches': Challenges to the American Friends Service Committee". Quaker History. 105 (Spring): 1–21. doi:10.1353/qkh.2016.0004. S2CID163984864.