Gaya APA
Moritz, H., Sagala, A. (2013).
Profile and directory of Indonesian companies ISO certificate .
Jakarta:
Wahyu Promo Citra.
Gaya MLA
Moritz, H.., Sagala, Aryanto.
"Profile and directory of Indonesian companies ISO certificate".
Jakarta:
Wahyu Promo Citra,
2013.
Cetak.