Vice President Jusuf Kalla walks together with President Joko Widodo after attending the launching of Sidarto Danusubroto’s book entitled Jalan Terjal Perubahan: Dari Ajudan Soekarno sampai Wantimpres Joko Widodo (The Long Winding Road of Change: From Soekarno’s Adjutant to  Joko Widodo’s Special Service) held at the Soehana Hall, Energy Building, SCBD, Jakarta on Sunday (Jun 12).