Santos, E. T. (1996). The Law on obligation and contract. International Academy of Management & Economics.
Lua i Stíl Chicago (17ú heag.)Santos, Emmanuel T. The Law on Obligation and Contract. Makati: International Academy of Management & Economics, 1996.
Lua MLA (9ú heag.)Santos, Emmanuel T. The Law on Obligation and Contract. International Academy of Management & Economics, 1996.
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