Birkel, M., & Sarkar, S. (1997). Ruling out a critical density baryonic universe.
芝加哥风格引文Birkel, M., 与 S. Sarkar. Ruling Out a Critical Density Baryonic Universe. 1997.
MLA引文Birkel, M., 与 S. Sarkar. Ruling Out a Critical Density Baryonic Universe. 1997.
警告：这些引文格式不一定是100％准确.