Sung-soo Kim, « A Prophet is not Welcome in His Own Land » dans An Examination of the Life and Legacy of A Korean Quaker, Ham Sokhon (1901-1989): Voice of the People and Pioneer of Religious Pluralism in Twentieth Century Korea, PhD thesis, Université de Sheffield, 1998.
Sung-soo Kim, « Ham the Promoter of Freedom » dans An Examination of the Life and Legacy of A Korean Quaker, Ham Sokhon (1901-1989): Voice of the People and Pioneer of Religious Pluralism in Twentieth Century Korea, PhD thesis, Université de Sheffield, 1998.