Cita APA (7a ed.)

Perry, A. (2018). Twenty-one days: A Daniel Pitt novel (First Edition.). Ballantine Books.

Cita Chicago Style (17a ed.)

Perry, Anne. Twenty-one Days: A Daniel Pitt Novel. First Edition. New York: Ballantine Books, 2018.

Cita MLA (8a ed.)

Perry, Anne. Twenty-one Days: A Daniel Pitt Novel. First Edition. Ballantine Books, 2018.

Precaución: Estas citas no son 100% exactas.