APA引文

Sigua, R. G. (2000). The state of road safety in the Philippines. Public Policy.

芝加哥风格引文

Sigua, Ricardo G. "The State of Road Safety in the Philippines." Public Policy 2000.

MLA引文

Sigua, Ricardo G. "The State of Road Safety in the Philippines." Public Policy, 2000.

警告：这些引文格式不一定是100％准确.