Kwakye-Awuah, B., F. J. K. Adzabe, I. Nkrumah, and C. Williams. “Application of Laboratory-Synthesized Ammonium Zeolite LTX As Soil Amendment Additive”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 12, no. 1, Oct. 2013, pp. 67-81, https://gssrr.org/index.php/JournalOfBasicAndApplied/article/view/1182.