Fulghum,Robert. (2007). What on earth have I done?: Stories, observations, and affirmations (NA.). ST-Martin's Press.
Chicago-referens (17:e uppl.)Fulghum,Robert. What on Earth Have I Done?: Stories, Observations, and Affirmations. NA. USA: ST-Martin's Press, 2007.
MLA-referens (9:e uppl.)Fulghum,Robert. What on Earth Have I Done?: Stories, Observations, and Affirmations. NA. ST-Martin's Press, 2007.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.