Usman. Nigerian Oil and Gas Industry Laws. Malthouse Press.
芝加哥风格引文Usman. Nigerian Oil and Gas Industry Laws. Malthouse Press.
MLA引文Usman. Nigerian Oil and Gas Industry Laws. Malthouse Press.
警告：这些引文格式不一定是100％准确.
APA引文
Usman. Nigerian Oil and Gas Industry Laws. Malthouse Press.
芝加哥风格引文Usman. Nigerian Oil and Gas Industry Laws. Malthouse Press.
MLA引文Usman. Nigerian Oil and Gas Industry Laws. Malthouse Press.