Não informado. (1974). Quarry management and products. Quarry Managers Journal.
Chicago-Zitierstil (17. Ausg.)Não informado. Quarry Management and Products. London: Quarry Managers Journal, 1974.
MLA-Zitierstil (8. Ausg.)Não informado. Quarry Management and Products. Quarry Managers Journal, 1974.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.