Obama, B. (2010). Of thee i sing: A letter to my daughters.
Cita Chicago Style (17a ed.)Obama, Barack. Of Thee I Sing: A Letter to My Daughters. 2010.
Cita MLA (8a ed.)Obama, Barack. Of Thee I Sing: A Letter to My Daughters. 2010.
Precaución: Estas citas no son 100% exactas.