Funding Universe Amnesty International Company History derived from International Directory of Company Histories, Vol. 50. St. James Press, 2003. Retrieved 2 January 2006
London Yearly Meeting (1974). "23.30 | Quaker faith & practice". qfp.quaker.org.uk (Fifth ed.). Archived from the original on 29 September 2020. Retrieved 29 September 2020.
Friends World Committee for Consultation (1976). "23.30 | Quaker faith & practice". qfp.quaker.org.uk (Fifth ed.). Archived from the original on 29 September 2020. Retrieved 29 September 2020.
London Yearly Meeting (1974). "23.30 | Quaker faith & practice". qfp.quaker.org.uk (Fifth ed.). Archived from the original on 29 September 2020. Retrieved 29 September 2020.
Friends World Committee for Consultation (1976). "23.30 | Quaker faith & practice". qfp.quaker.org.uk (Fifth ed.). Archived from the original on 29 September 2020. Retrieved 29 September 2020.