Kolff, G. H. V. D. (1936). The Historical development of the labour relationships in a remote corner of java as they apply to the cultivation of rice: Provisional results of local investigations. Batavia: National Council for the Netherlands and the Netherlands Indies of the Institute of Pacific Relations.

Kolff, G. H. Van Der. The Historical Development of the Labour Relationships in a Remote Corner of Java As They Apply to the Cultivation of Rice: Provisional Results of Local Investigations. Batavia: National Council for the Netherlands and the Netherlands Indies of the Institute of Pacific Relations, 1936.

Kolff, G. H. Van Der. The Historical Development of the Labour Relationships in a Remote Corner of Java As They Apply to the Cultivation of Rice: Provisional Results of Local Investigations. Batavia: National Council for the Netherlands and the Netherlands Indies of the Institute of Pacific Relations, 1936.