Pineda, E. L. (2000). Obligations and contracts. Central Professional Books.
Lua i Stíl Chicago (17ú heag.)Pineda, Ernesto L. Obligations and Contracts. Quezon City: Central Professional Books, 2000.
Lua MLA (9ú heag.)Pineda, Ernesto L. Obligations and Contracts. Central Professional Books, 2000.
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