Birkel, M., & Sarkar, S. (1998). Extremely high energy cosmic rays from relic particle decays.
芝加哥风格引文Birkel, M., 与 S. Sarkar. Extremely High Energy Cosmic Rays from Relic Particle Decays. 1998.
MLA引文Birkel, M., 与 S. Sarkar. Extremely High Energy Cosmic Rays from Relic Particle Decays. 1998.
警告：这些引文格式不一定是100％准确.