Suliman, Ashwag, Howida T. Jepreel, Mohammed Osman A. Warrag, and Tagelsir I. M. Idris. “Responses of Periwinkle (Catharanthus Roseus) to Soil and Foliar Applications of Haza (Haplophyllum Tuberculatum).”. GPH-International Journal of Agriculture and Research E-ISSN 2805-4362 P-ISSN 2805-4340 2, no. 05 (July 15, 2019): 01-13. Accessed January 28, 2023. http://gphjournal.org/index.php/ar/article/view/221.