APA-Zitierstil (7. Ausg.)

Booher, D. D. (2013). How to write apology letters: 57 ready-to-use letters. Booher Consultants.

Chicago-Zitierstil (17. Ausg.)

Booher, Dianna Daniels. How to Write Apology Letters: 57 Ready-to-use Letters. Colleyville, Tex: Booher Consultants, 2013.

MLA-Zitierstil (9. Ausg.)

Booher, Dianna Daniels. How to Write Apology Letters: 57 Ready-to-use Letters. Booher Consultants, 2013.