APA
Gartside L., . (1986). Modern business correspondence. London: Macdonald and Evans.
Chicago
Gartside L, . 1986. Modern business correspondence. London: Macdonald and Evans.
Harvard
Gartside L., . (1986). Modern business correspondence. London: Macdonald and Evans.
MLA
Gartside L, . Modern business correspondence. London: Macdonald and Evans. 1986.