APA citiranje

Great Britain. Welsh Office. Highways Directorate. (1990). Roads in upland areas: A design guide = Ffyrdd mewn ucheldiroedd canllaw cynllunio. Highways Directorate, Welsh Office.

Chicago Style (17th ed.) Citation

Great Britain. Welsh Office. Highways Directorate. Roads in Upland Areas: A Design Guide = Ffyrdd Mewn Ucheldiroedd Canllaw Cynllunio. Cardiff.: Highways Directorate, Welsh Office, 1990.

MLA citiranje

Great Britain. Welsh Office. Highways Directorate. Roads in Upland Areas: A Design Guide = Ffyrdd Mewn Ucheldiroedd Canllaw Cynllunio. Highways Directorate, Welsh Office, 1990.