Government Service Insurance System (GSIS). (2011). GSIS art competition: 2011. [Government Service Insurance System].
芝加哥风格引文Government Service Insurance System (GSIS). GSIS Art Competition: 2011. [Pasay City]: [Government Service Insurance System], 2011.
MLA引文Government Service Insurance System (GSIS). GSIS Art Competition: 2011. [Government Service Insurance System], 2011.
警告：这些引文格式不一定是100％准确.