APA (7th ed.) Citation

Cecelia Ahern. (2007). PS i love you: Sometimes it's about living life one letter at a time. Harper Collins.

Chicago Style (17th ed.) Citation

Cecelia Ahern. PS I Love You: Sometimes It's About Living Life One Letter at a Time. London: Harper Collins, 2007.

MLA (9th ed.) Citation

Cecelia Ahern. PS I Love You: Sometimes It's About Living Life One Letter at a Time. Harper Collins, 2007.

Warning: These citations may not always be 100% accurate.