The Rijksmuseum | Documentation “Fotokopieën in documentatiemap NG: W.M.F. Mansvelt en P. Creutzberg. Changing Economy in Indonesia - Volume 1 - Indonesia's export crops 1816-1940. Martinus Nijhoff (Den Haag) 1975 en A.G.N. Swart L.L.D. Rubber Companies in the Netherland East Indies. J.H. de Bussy (Amsterdam) 1914, p. 296-388.”