Johnson, P. (2005). Business economics-I. Manan Prakashan.
Lua i Stíl Chicago (17ú heag.)Johnson, P. Business Economics-I. Mumbai: Manan Prakashan, 2005.
Lua MLA (9ú heag.)Johnson, P. Business Economics-I. Manan Prakashan, 2005.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.