Roxas, S. K. (1971). Tondo: Four hundred years of urbanization. Sunday Times Magazine.
Lua i Stíl Chicago (17ú heag.)Roxas, Sixto K. "Tondo: Four Hundred Years of Urbanization." Sunday Times Magazine 1971.
Lua MLA (9ú heag.)Roxas, Sixto K. "Tondo: Four Hundred Years of Urbanization." Sunday Times Magazine, 1971.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.