Cita APA (7th ed.)

Fulghum,Robert. (2007). What on earth have I done?: Stories, observations, and affirmations (NA.). ST-Martin's Press.

Cita Chicago (17th ed.)

Fulghum,Robert. What on Earth Have I Done?: Stories, Observations, and Affirmations. NA. USA: ST-Martin's Press, 2007.

Cita MLA (9th ed.)

Fulghum,Robert. What on Earth Have I Done?: Stories, Observations, and Affirmations. NA. ST-Martin's Press, 2007.