S. K. SHAHEEN, K. VIJAYALAKSHMI, K. PAVANA JYOTSNA, N. D. PRASANNA, G. REVATHI, and P. JAYALAKSHMI. 2010. “ISOLATION AND CHARACTERIZATION OF NITRIFYING BACTERIA FROM THE GUT OF EARTHWORM (EISENIA FOETIDA)”. The Bioscan 5 (4):613-16. https://thebioscan.com/index.php/pub/article/view/1346.