Gaya APA

education, D, G, M, P, P, A, S. (2009). Scence student book for junior high school year VII . : Directorate of junior high school development.

Gaya MLA

education, Directorate, General, Management, Pf, Primary, And, Secondary. "Scence student book for junior high school year VII". : Directorate of junior high school development, 2009. Text.