Fulghum,Robert. (2007). What on earth have I done?: Stories, observations, and affirmations (NA.). ST-Martin's Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रFulghum,Robert. What on Earth Have I Done?: Stories, Observations, and Affirmations. NA. USA: ST-Martin's Press, 2007.
एमएलए (9वां संस्करण) प्रशस्ति पत्रFulghum,Robert. What on Earth Have I Done?: Stories, Observations, and Affirmations. NA. ST-Martin's Press, 2007.
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