L. Marpaung, D. N. Silitonga, D. S. . Saruksuk, R. Purba, . B. N. A. Lubis, and . B. N. A. Lubis, “THE CHILDREN’S ABILITY TO PRONOUNCE CAPITAL LETTERS IN WORDS AT THE AGE OF 2-3 YEARS IN KAMPUNG LALANG MEDAN”, ELT, vol. 4, no. 2, pp. 19-30, Dec. 2022.