Bello, A. L. (2007). Economics: An introduction. C & E Pub.
Lua i Stíl Chicago (17ú heag.)Bello, Amelia L. Economics: An Introduction. Quezon City: C & E Pub, 2007.
Lua MLA (9ú heag.)Bello, Amelia L. Economics: An Introduction. C & E Pub, 2007.
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