(1949). Petroleum act of 1949 (R.A.387). s.n.
芝加哥风格引文Petroleum Act of 1949 (R.A.387). s.l: s.n, 1949.
MLA引文Petroleum Act of 1949 (R.A.387). s.n, 1949.
警告：这些引文格式不一定是100％准确.
APA引文
(1949). Petroleum act of 1949 (R.A.387). s.n.
芝加哥风格引文Petroleum Act of 1949 (R.A.387). s.l: s.n, 1949.
MLA引文Petroleum Act of 1949 (R.A.387). s.n, 1949.