Before revision: Sources Sumner, Claude, The Source of African Philosophy: the Ethiopian Philosophy of Man, Stuttgart: Franz Steiner Verlag Wiesbaden, 1986 Sumner, Claude, "Ethiopia, philosophy in", In E. Craig (Ed.
After revision: See alsoEthiopian calendarSources Sumner, Claude, The Source of African Philosophy: the Ethiopian Philosophy of Man, Stuttgart: Franz Steiner Verlag Wiesbaden, 1986 Sumner, Claude, "Ethiopia, philosophy in", In E. Craig (Ed.