APA

Chappell C., . (2006). How to write better letters. : Penguin books.

Chicago

Chappell Cherry, . 2006. How to write better letters. : Penguin books.

Harvard

Chappell C., . (2006). How to write better letters. : Penguin books.

MLA

Chappell Cherry, . How to write better letters. : Penguin books. 2006.