Johnson, P. A. (2013). Business Economics - III Sem - VI (T.Y.Bcom). Manan Prakashan.
Lua i Stíl Chicago (17ú heag.)Johnson, P. A. Business Economics - III Sem - VI (T.Y.Bcom). Mumbai: Manan Prakashan, 2013.
Lua MLA (9ú heag.)Johnson, P. A. Business Economics - III Sem - VI (T.Y.Bcom). Manan Prakashan, 2013.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.