Zainalabideen AL-Husseini. “Using the R Statistical Programming Language to Estimate the Mediation Variables Influencing the Presence of the Proportion of Elements in the Soil”. Zien Journal of Social Sciences and Humanities 7 (April 13, 2022): 41–50. Accessed November 26, 2024. https://zienjournals.com/index.php/zjssh/article/view/1241.