Schon, J. F., & Crowther, S. (1970). Journals of the Rev. James Frederick Schon and Mr. Samuel Crowther: Who, with the sanction of Her Majesty's Government, accompanied the expedition up the Niger in 1841 on behalf of the Church Missionary Society (Second edition.). Cass.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Schon, James Frederick, و Samuel Crowther. Journals of the Rev. James Frederick Schon and Mr. Samuel Crowther: Who, with the Sanction of Her Majesty's Government, Accompanied the Expedition Up the Niger in 1841 on Behalf of the Church Missionary Society. Second edition. London: Cass, 1970.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Schon, James Frederick, و Samuel Crowther. Journals of the Rev. James Frederick Schon and Mr. Samuel Crowther: Who, with the Sanction of Her Majesty's Government, Accompanied the Expedition Up the Niger in 1841 on Behalf of the Church Missionary Society. Second edition. Cass, 1970.