(1998). Total world population: 6B in 1999. Manila Times.
Lua i Stíl Chicago (17ú heag.)"Total World Population: 6B in 1999." Manila Times 1998.
Lua MLA (9ú heag.)"Total World Population: 6B in 1999." Manila Times, 1998.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.