APA (7th ed.) Citation

Gree, A. (2013). My first book of letters. Button Books.

Chicago Style (17th ed.) Citation

Gree, Alain. My First Book of Letters. [S.l.]: Button Books, 2013.

MLA (9th ed.) Citation

Gree, Alain. My First Book of Letters. Button Books, 2013.

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