APA

Linton L., . (1997). 30 minute to write Sales letters. London: Kogan page limited.

Chicago

Linton Lan, . 1997. 30 minute to write Sales letters. London: Kogan page limited.

Harvard

Linton L., . (1997). 30 minute to write Sales letters. London: Kogan page limited.

MLA

Linton Lan, . 30 minute to write Sales letters. London: Kogan page limited. 1997.