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^Zimmermann, J. (1860). The New Testament (Ga translation), 2nd edition, London, 1872, new revised edition 1889, corrected reprint 1908, corrected reprint 1911. London.{{cite book}}: CS1 maint: location missing publisher (link)
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^Sebald, Peter (1994). "Christian Jacob Protten Africanus (1715-1769) - erster Missionar einer deutschen Missionsgesellschaft in Schwarzafrika". Kolonien und Missionen. (in German): 109–121. OCLC610701345.
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