found: His The neglected duty, 1986:CIP t.p. (Johannes J.G. Jansen) data sheet (Arabic, Persian, and Turkish Dept., Faculty of Arts, Leiden University, The Netherlands)
found: The dual nature of Islamic fundamentalism, 1996:CIP t.p. (Johannes J.C. Jansen) data sheet (b. Nov. 17, 1942) bk. t.p. (Johannes J. G. Jansen)
found: KB Netherlands online Sept. 30, 2008(Jansen, Johannes J. G.; variant: Hans Jansen, b. 1942 [not the same as another Hans Jansen, also b. in 1942])
found: The interpretation of the Koran in modern Egypt, 1980:t.p. (J.J.G. Jansen)
