University of Edinburgh. Department of Urban Design and Regional Planning. Planning Research Unit & Great Britain. Scottish Development Department. (1973). Threshold analysis manual. Her Majesty's Stationery Office.
Cita Chicago (17th ed.)University of Edinburgh. Department of Urban Design and Regional Planning. Planning Research Unit i Great Britain. Scottish Development Department. Threshold Analysis Manual. Edinburgh: Her Majesty's Stationery Office, 1973.
Cita MLA (9th ed.)University of Edinburgh. Department of Urban Design and Regional Planning. Planning Research Unit i Great Britain. Scottish Development Department. Threshold Analysis Manual. Her Majesty's Stationery Office, 1973.
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