Helffrich, G., & Wood, B. (2001). The Earth's mantle.
芝加哥风格引文Helffrich, G., 与 B. Wood. The Earth's Mantle. 2001.
MLA引文Helffrich, G., 与 B. Wood. The Earth's Mantle. 2001.
警告：这些引文格式不一定是100％准确.
APA引文
Helffrich, G., & Wood, B. (2001). The Earth's mantle.
芝加哥风格引文Helffrich, G., 与 B. Wood. The Earth's Mantle. 2001.
MLA引文Helffrich, G., 与 B. Wood. The Earth's Mantle. 2001.