Gaya APA

Widayat, , D., Adhitya, A, J. (1990). Roughness Calibration Studies Using Different Measuring Systems . : HPJI.

Gaya MLA

Widayat, , Djoko., Adhitya, Alvin, Jonathan. "Roughness Calibration Studies Using Different Measuring Systems". : HPJI, 1990. Computer Software.