1. A. G. J. Tacon, M. Metian, and M. R. Hasan, Feed ingredients and fertilizers for farmed aquatic animals (Food And Agriculture Organization Of The United Nations, Rome, 2009), pp. 11–12.
2. B. A. Schumacher, Methods For The Determination Of Total Organic Carbon (TOC) In Soils And Sediments (Ecological Risk Assessment Support Center Office of Research and Development US, Environmental Protection Agency, Las Vegas, 2002), pp. 1–25.
3. Permentan, Peraturan Menteri Pertanian Nomor 70/Permentan/SR.140/10/2011 Tentang Pupuk Organik, Pupuk Hayati Dan Pembenah Tanah, (Kementerian Pertanian Republik Indonesia, Jakarta, 2011), pp. 1.
4. S. A. M. Ali, C. Payus, and M. M. Ali, Malaysian Journal of Analytical Sciences, 19 (2), 318–324 (2015).
5. D. Harvey, Modern Analytical Chemistry, (McGraw-Hill Companies, San Francisco, California, USA, 2008), pp. 379–381.