Cassell, M. (1990). Dig it burn it sell it!: The story of Ibstock Johnsen 1825-1990. Pencorp.
Cita Chicago (17th ed.)Cassell, Michael. Dig It Burn It Sell It!: The Story of Ibstock Johnsen 1825-1990. London: Pencorp, 1990.
Cita MLA (8th ed.)Cassell, Michael. Dig It Burn It Sell It!: The Story of Ibstock Johnsen 1825-1990. Pencorp, 1990.
Atenció: Aquestes cites poden no estar 100% correctes.