DICKSON D E N. (1991). IMPROVE YOUR BUSINESS: WORKBOOK. OXFORD UNIVERSITY PRESS.
Lua i Stíl Chicago (17ú heag.)DICKSON D E N. IMPROVE YOUR BUSINESS: WORKBOOK. MUMBAI MADRAS: OXFORD UNIVERSITY PRESS, 1991.
Lua MLA (9ú heag.)DICKSON D E N. IMPROVE YOUR BUSINESS: WORKBOOK. OXFORD UNIVERSITY PRESS, 1991.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.