Trotman-Dickenson, D. I. (1969). Economic Workbook and Data. ELSEVIER.
Lua i Stíl Chicago (17ú heag.)Trotman-Dickenson, D. I. Economic Workbook and Data. ELSEVIER, 1969.
Lua MLA (8ú heag.)Trotman-Dickenson, D. I. Economic Workbook and Data. ELSEVIER, 1969.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.