Private letters, 1890-1893; travelogues, diary notes, correspondence with Trittelvitz, 1905-1914; manuscripts, fragments, diaries, etc.: "The first visit of German children to Queen Msinga of Rwanda, "Back to Queen Msinga, "Observations on the Characteristics of Natives, 1907-1908; General Correspondence and Monthly Reports, 1927-1929; Bugufi calls us - Bugufi needs us, 1929; Letter of Native Christians from Bukoba to the Bishop of Central Tanzania, 1929; Impressions and thoughts during a journey into the landscapes of Mischenye u. Karagwe, 1929; Questionnaires with personal data and birth dates of 14 children, 1930; "Church Mission Society u. Bethel-Bielefeld Mission in Bukoba, German and English version by E. Johanssen, 1930; Correspondence with E. Johanssen, 1930-1933; death notice and memorial certificate, 1934; correspondence with Martha Johanssen, 1934-1940; "On the 100th birthday of E. Johanssen, 1964; "On the 100th birthday of E. Johanssen, by J. Busse, with the addition of Albrecht sen.., 1971
Bethel MissionMemories of Missionary Johanssen von Walther Trittelvitz in the news of the Bethel Mission, 1934; "In Service as Court Preacher by Ernst Johanssen, 1935; Life Picture of Ernst Johanssen by Gerhard Jasper in "Licht u. Leben, 1937; "Der Beitrag der Bethel-Mission zur missionarischen Verkünigung (Doctor Ernst Johanssen) by Gerhard Jasper, 1936; "Die missionarische Art von Missionar Pastor Doktor Ernst Johanssen von Gerhard Jasper im Missions-Jahrbuch 1936; "Missionar Doktor Johanssen, der Witge - Ein Vortrag von Gerhard Jasper, Konzept u. Quellentexte, o.J.
Bethel MissionA missionary study on "Leadership and Experience by Ernst Johanssen, conceived by his son-in-law Pastor Gerhard Jasper Sr., about 1940; documents on "Leadership and Experience by Dr. Ernst Johanssen, published after his death by his son-in-law Pastor Gerhard Jasper Sr., including source texts, remarks and correspondence on "Leadership and Experience, Sources on the Relationship of the Bethel Mission and Church Mission Society, Rwanda and the final section
Bethel Mission"The Missionary Way of Pastor Doctor Ernst Johanssen - A Pioneer Missionary of the Bethel Mission (1864-1934), c. 1938; "The Contribution of the Bethel Mission to the Missionary Annunciation, 101 p., partly as stenograph, n.a.
Bethel Mission„Church Mission Society u. Bethel-Mission in Bukoba, 23 S., ms.
Bethel Mission