Payumo, F. C. (1999). Industrial peace plus skilled labor. Manila Bulletin.
Lua i Stíl Chicago (17ú heag.)Payumo, Felicito C. "Industrial Peace Plus Skilled Labor." Manila Bulletin 1999.
Lua MLA (9ú heag.)Payumo, Felicito C. "Industrial Peace Plus Skilled Labor." Manila Bulletin, 1999.
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