APA

Trask, . (2005). Hwo to write effective emails. : Penguin books.

Chicago

Trask, . 2005. Hwo to write effective emails. : Penguin books.

Harvard

Trask, . (2005). Hwo to write effective emails. : Penguin books.

MLA

Trask, . Hwo to write effective emails. : Penguin books. 2005.