Roni Hidayat Ridwan. (2006). Sektor Perlombongan. Penerbitan Hartamas.
Chicago Style (17th ed.) CitationRoni Hidayat Ridwan. Sektor Perlombongan. Kuala Lumpur: Penerbitan Hartamas, 2006.
MLA (8th ed.) CitationRoni Hidayat Ridwan. Sektor Perlombongan. Penerbitan Hartamas, 2006.
Warning: These citations may not always be 100% accurate.