Cita APA (7a ed.)

Ziefert, H., & Barroux. (2013). It's time to say goodnight (First edition.). Blue Apple Books.

Cita Chicago Style (17a ed.)

Ziefert, Harriet, y Barroux. It's Time to Say Goodnight. First edition. Maplewood, NJ: Blue Apple Books, 2013.

Cita MLA (8a ed.)

Ziefert, Harriet, y Barroux. It's Time to Say Goodnight. First edition. Blue Apple Books, 2013.

Precaución: Estas citas no son 100% exactas.