Barnes, B. H. (1933). Johnson of Nyasaland: A study of the life and work of William Percival Johnson, D.D., archdeacon of Nyasa, missionary pioneer 1876-1928. Universities' Mission to Central Africa.
Chicago-referens (17:e uppl.)Barnes, Bertram Herbert. Johnson of Nyasaland: A Study of the Life and Work of William Percival Johnson, D.D., Archdeacon of Nyasa, Missionary Pioneer 1876-1928. Westminster: Universities' Mission to Central Africa, 1933.
MLA-referens (8:e uppl.)Barnes, Bertram Herbert. Johnson of Nyasaland: A Study of the Life and Work of William Percival Johnson, D.D., Archdeacon of Nyasa, Missionary Pioneer 1876-1928. Universities' Mission to Central Africa, 1933.
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