Johnson, P. (2005). Business economics I F.Y.B.Com. Manan Prakashan.
Lua i Stíl Chicago (17ú heag.)Johnson, P.A. Business Economics I F.Y.B.Com. Mumbai: Manan Prakashan, 2005.
Lua MLA (9ú heag.)Johnson, P.A. Business Economics I F.Y.B.Com. Manan Prakashan, 2005.
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