RADKE, M. (1972). Manual Of Cost Reduction Techniques / Magnus Radke. McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)RADKE, Magnus. Manual Of Cost Reduction Techniques / Magnus Radke. McGraw-Hill, 1972.
Lua MLA (8ú heag.)RADKE, Magnus. Manual Of Cost Reduction Techniques / Magnus Radke. McGraw-Hill, 1972.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.