Afifi, Muhammad, et al. “DETERMINATION OF LEAD (PB) CONTAMINATION IN LETTUCE (Lactuca Sativa L.) FROM VARIOUS COLLECTION SOURCES IN BANDA ACEH, INDONESIA”. Jurnal Crystal : Publikasi Penelitian Kimia Dan Terapannya, vol. 8, no. 1, Mar. 2026, pp. 73-80, doi:10.36526/jc.v8i1.7164.