Frehner. Finding Oil. University of Nebraska Press.
芝加哥风格引文Frehner. Finding Oil. University of Nebraska Press.
MLA引文Frehner. Finding Oil. University of Nebraska Press.
警告：这些引文格式不一定是100％准确.
APA引文
Frehner. Finding Oil. University of Nebraska Press.
芝加哥风格引文Frehner. Finding Oil. University of Nebraska Press.
MLA引文Frehner. Finding Oil. University of Nebraska Press.