W., W., D. Marzal, and H. Juwita. “INSTRUCTIONAL DESIGN LINES AND ANGLES WITH THE CONTEXT OF A RAILING REED IN CLASS VII”. JOURNAL of MATHEMATICS SCIENCE and EDUCATION, Vol. 1, no. 1, Dec. 2018, pp. 118-30, doi:https://doi.org/10.31540/jmse.v1i1.186.