Edmonds, G. (1982). Road maintenance: Options for improvement. International Labour Office.
Cita Chicago (17th ed.)Edmonds, G.A. Road Maintenance: Options for Improvement. Geneva: International Labour Office, 1982.
Cita MLA (9th ed.)Edmonds, G.A. Road Maintenance: Options for Improvement. International Labour Office, 1982.
Atenció: Aquestes cites poden no estar 100% correctes.