Gaya APA

education, D, G, M, O, P, A, S. (2009). Student Book Mathematics grade IX junior high school . : Directorate general management of primary and secondary education.

Gaya MLA

education, Directorate, General, Management, Of, Primary, And, Secondary. "Student Book Mathematics grade IX junior high school". : Directorate general management of primary and secondary education, 2009. Text.