Riski Erai Kami, Wiyogo and Jhonni Rentas Duling (2019) “PENGARUH SNOWBALL THROWING TERHADAP HASIL BELAJAR SISTEM PNEUMATIK KELAS X SMKN 1 BUNTOK”, Steam Engineering, 1(1), pp. 11–16. doi: 10.37304/jptm.v1i1.110.