Bizzen, R. G. (1999). Mutual defense treaty is needed, valid. Manila Bulletin.
Lua i Stíl Chicago (17ú heag.)Bizzen, Rodolfo G. "Mutual Defense Treaty Is Needed, Valid." Manila Bulletin 1999.
Lua MLA (9ú heag.)Bizzen, Rodolfo G. "Mutual Defense Treaty Is Needed, Valid." Manila Bulletin, 1999.
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