Yuliantini, N.N. , Paramita, I.G.A.D., Setyono, E.Y. and Suciani, N.K. 2021. The use of whatsapp cooperative learning to improve writing ability . Journal of Applied Studies in Language . 5, 2 (Dec. 2021), 245–251. DOI:https://doi.org/10.31940/jasl.v5i2.245-251.