AGGARWAL R.S. (1999). MODERN APPROACH TO NON VERBAL REASONING. S.CHAND & CO.
Lua i Stíl Chicago (17ú heag.)AGGARWAL R.S. MODERN APPROACH TO NON VERBAL REASONING. NEW DELHI: S.CHAND & CO, 1999.
Lua MLA (9ú heag.)AGGARWAL R.S. MODERN APPROACH TO NON VERBAL REASONING. S.CHAND & CO, 1999.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.