Henry Hamilton Johnston: George Grenfell and the Congo. 2 Bde., London: Hutchinson, 1908. (A history and description of the Congo Independent State and adjoining districts of Congoland, together with some account of the native peoples and their languages, the fauna and flora; and similar notes on the Cameroons and the island of Fernando Pô, the whole founded on the diaries and researches of the late Rev. George Grenfell, B.M.S., F.R.G.S.; and on the records of the British Baptist Missionary Society; and on additional information contributed by the author, by the Rev. Lawson Forfeitt, Mr. Emil Torday, and others). Reprint, New York: Kraus, 19XX.
George Hawker: The life of George Grenfell, Congo missionary and explorer. London: The Religious tract society, 1909. Digitalisat
Harry Lathey Hemmens: George Grenfell: pioneer in Congo. London: Student Christian Movement, 1927.
Shirley J. Dickins: Grenfell of the Congo. Pioneer, missionary, and explorer. London: Sunday School Union, 1910.
↑J. Gordon Melton: Grenfell, George (1849–1906). Baptist missionary leader in Africa. In: Encyclopedia of World Religions. Encyclopedia of Protestantism, Nr.6. Facts of File, New York 2005, ISBN 978-0-8160-5456-5, S.251 (englisch).