Não informado. (1974). Quarry management and products. Quarry Managers Journal.
Chicago-referens (17:e uppl.)Não informado. Quarry Management and Products. London: Quarry Managers Journal, 1974.
MLA-referens (8:e uppl.)Não informado. Quarry Management and Products. Quarry Managers Journal, 1974.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.