Tipparach, J.; Utthachat, N. .; Sujaritjan, N. .; Sujaritjan, P. .; Chokhirannakin, J. . Analysis of the Use of English Restrictive Relative Clauses of the 2nd Year Students in Business English Program, Ubon Ratchathani Rajabhat University. Pitchayatat 2022, 17, 221-231.