Suandy, E. Girsang, A. N. Nasution, and I. N. E. . Lister. “Analysis of Protein Content, Spectrophotometry FT-IR, and Antibacterial Effects of Earthworm (Eudriluseugenia)”. American Scientific Research Journal for Engineering, Technology, and Sciences, vol. 63, no. 1, Jan. 2020, pp. 94-101, https://www.asrjetsjournal.org/index.php/American_Scientific_Journal/article/view/5490.