Government Service Insurance System (GSIS). (2011). GSIS art competition: 2011. [Government Service Insurance System].
Citazione stile Chigago Style (17a edizione)Government Service Insurance System (GSIS). GSIS Art Competition: 2011. [Pasay City]: [Government Service Insurance System], 2011.
Citatione MLA (9a ed.)Government Service Insurance System (GSIS). GSIS Art Competition: 2011. [Government Service Insurance System], 2011.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.