Kuwornu, JOHN K. M., Alfred B. Narh JNR, Irene S. Egyir, Edvard E. Onumah, and Solomie Gebrezgabher. 2017. “Willingness to Pay for Excreta Pellet Fertilizer: Empirical Evidence from Ghana”. Acta Agriculturae Slovenica 109 (2): 315–323. https://doi.org/10.14720/aas.2017.109.2.14.