1. [1] Tombeng RB, Polii B, Sinolungan S: Analisis kualitatif kandungan Eschericia Coli dan Coliform pada 3 depot air minum isi ulang di Kota Manado. Jurnal Kesehatan Masyarakat Universitas Sam Ratulangi ., 1 (7), 2013. [in Indonesian with English abstract] http://fkm.unsrat.ac.id/wp-content/uploads/2013/08/Jurnal-Risky-Tombeng-KESLING.pdf
2. [2] Wulandari S, Arum S, Anik S: Higiene dan sanitasi serta kualitas bakteriologis Damiu di sekitar Universitas Negeri Semarang. Unnes Journal of Public Health. , 4 (3), 8–15, 2015. [in Indonesian with English abstract] https://journal.unnes.ac.id/sju/index.php/ujph/article/view/6338
3. [3] Sima LC, Elimelech M: More than a drop in the bucket: decentralized membrane-based drinking water refill stations in southeast Asia. Environ. Sci. Technol. , 47 (14), 7580–7588, 2013. PMID:, doi:https://doi.org/10.1021/es304384n
4. [4] Sima L, Elimelech M: Informal small-scale water services in developing countries: the business of water for those without formal municipal connections. Water and sanitation related diseases and the environment: Challenges, interventions and preventive measure. In: Selendy JMH (Ed): Water and Sanitation Related Diseases and the Environment: Challenges, interventions and preventive measure, Wiley International, Hoboken, USA, 2011.
5. [5] Gebauer H, Saul CJ: Business model innovation in the water sector in developing countries. Sci. Total Environ. , 488-489 , 512–520, 2014. doi:10.1016/j.scitotenv.2014.02.046