Fulghum,Robert. (2007). What on earth have I done?: Stories, observations, and affirmations (NA.). ST-Martin's Press.
芝加哥风格引文Fulghum,Robert. What on Earth Have I Done?: Stories, Observations, and Affirmations. NA. USA: ST-Martin's Press, 2007.
MLA引文Fulghum,Robert. What on Earth Have I Done?: Stories, Observations, and Affirmations. NA. ST-Martin's Press, 2007.
警告：这些引文格式不一定是100％准确.