1. Van Zuidam, ITC, Enschede, the Netherlands, (1983)
2. Statistical Center Board (BPS) Candiroto Sub-District, (2018)
3. Statistical Center Board (BPS) Gemawang Sub-District, (2018)
4. Statistical Center Board (BPS) Jumo Sub-District (2018)
5. Statistical Center Board (BPS) Kandangan Sub-District (2018)