Não informado. (2002). Canadian pit and quarry. National Business Publications.
Chicagoスタイル(17版)引用形式Não informado. Canadian Pit and Quarry. Gardenvale, Canada: National Business Publications, 2002.
MLA(8版)引用形式Não informado. Canadian Pit and Quarry. National Business Publications, 2002.
警告: この引用は必ずしも正確ではありません.