Panjaitan, N. B., C. V. K. Tobing, and G. O. Rumondor. “The Effectiveness of Using Total Physical Response Storytelling (TPRS) to Enhance Students’ Vocabulary”. 11th International Scholars Conference, vol. 5, no. 1, Oct. 2017, p. 110, doi:10.35974/isc.v5i1.1541.