D. Azaidane, M. A. Putra, N. R. P. Kuswara, S. A. Ariani, N. Septamevia, and B. N. Abdurrahman, “The Use of Non-Standard Indonesian Language Varieties in Non-Formal Communication in the Student Environment of UPN Veteran East Java”, kirana, vol. 3, no. 1, pp. 21–27, Mar. 2026.