Sarmiento, P. (1998). Metal production strong in 1st qtr, dismal in 2nd qtr. Manila Times.
Chicago Style aipamenaSarmiento, Prime. "Metal Production Strong in 1st Qtr, Dismal in 2nd Qtr." Manila Times 1998.
MLA aipamenaSarmiento, Prime. "Metal Production Strong in 1st Qtr, Dismal in 2nd Qtr." Manila Times, 1998.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.