Karuku, George Njomo, and Benson O Mochoge. “Nitrogen Forms in Three Kenyan Soils Andosols, Lucidols and Ferralsols”. International Journal for Innovation Education and Research 4, no. 10 (October 1, 2016): 17–30. Accessed April 4, 2025. https://scholarsjournal.net/index.php/ijier/article/view/594.