(1981). A glimpse of the past: A tourist's guide to industrial trails, slate quarries, mines, mills. Cardiff: Wales Tourist Board.
Cita Chicago (17th ed.)A Glimpse of the Past: A Tourist's Guide to Industrial Trails, Slate Quarries, Mines, Mills. Cardiff: Wales Tourist Board, 1981.
Cita MLA (8th ed.)A Glimpse of the Past: A Tourist's Guide to Industrial Trails, Slate Quarries, Mines, Mills. Cardiff: Wales Tourist Board, 1981.
Atenció: Aquestes cites poden no estar 100% correctes.