Cruz, O. V. (2008). Signs and times. CBCP Communications Development Foundation.
Citazione stile Chigago Style (17a edizione)Cruz, Oscar V. Signs and Times. Intramuros, Manila: CBCP Communications Development Foundation, 2008.
Citatione MLA (9a ed.)Cruz, Oscar V. Signs and Times. CBCP Communications Development Foundation, 2008.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.