Ahern,Cecelia. PS I Love you. Harper collins.
Cita Chicago (17th ed.)Ahern,Cecelia. PS I Love You. London: Harper collins.
Cita MLA (9th ed.)Ahern,Cecelia. PS I Love You. Harper collins.
Atenció: Aquestes cites poden no estar 100% correctes.
Cita APA (7th ed.)