Requintina, R. R. (1998). 12,000 RP plants have medicinal value. Manila Bulletin.
Lua i Stíl Chicago (17ú heag.)Requintina, Robert R. "12,000 RP Plants Have Medicinal Value." Manila Bulletin 1998.
Lua MLA (9ú heag.)Requintina, Robert R. "12,000 RP Plants Have Medicinal Value." Manila Bulletin, 1998.
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