A. Mohammad, Amjad. “Effect of Different Concentrations of Ammonium Nitrate and Potassium Nitrate in Growth and Differentiation of Lettuce Plant (Lactuca Sativa L.) and Protein Content”. Rafidain Journal of Science 18, no. 6 (December 1, 2007): 182–195. Accessed September 28, 2025. https://jamh.uomosul.edu.iq/index.php/rsci/article/view/47312.