Kolby, J. (2011). GRE 4000: The 4000 words essential for the GRE. Nova Press.
芝加哥风格引文Kolby, Jeff. GRE 4000: The 4000 Words Essential for the GRE. Los Angeles: Nova Press, 2011.
MLA引文Kolby, Jeff. GRE 4000: The 4000 Words Essential for the GRE. Nova Press, 2011.
警告：这些引文格式不一定是100％准确.