Sukhdeep Singh. “ANALYSIS OF HEAVY METALS CONTAMINATION ON GROUNDWATER RESOURCES AND SURFACE SOILS IN THE VICINITY OF BUDDHA NULLAH STREAM IN LUDHIANA, PUNJAB”. Vidhyayana - An International Multidisciplinary Peer-Reviewed E-Journal - ISSN 2454-8596, vol. 6, no. 6, June 2021, http://j.vidhyayanaejournal.org/index.php/journal/article/view/529.