Nygaard, R., & Doud, G. R. (1994). Tragedy to triumph. David C.Cook.
芝加哥风格引文Nygaard, Reuel, 与 Guy R. Doud. Tragedy to Triumph. Illinois: David C.Cook, 1994.
MLA引文Nygaard, Reuel, 与 Guy R. Doud. Tragedy to Triumph. David C.Cook, 1994.
警告：这些引文格式不一定是100％准确.