Burbidge, N., Gray, P., & Levy, S. Letters (2a ed.).
芝加哥风格引文Burbidge, Nicky, Peta Gray, 与 Sheila Levy. Letters. 2a ed.
MLA引文Burbidge, Nicky, et al. Letters. 2a ed.
警告：这些引文格式不一定是100％准确.
APA引文
Burbidge, N., Gray, P., & Levy, S. Letters (2a ed.).
芝加哥风格引文Burbidge, Nicky, Peta Gray, 与 Sheila Levy. Letters. 2a ed.
MLA引文Burbidge, Nicky, et al. Letters. 2a ed.