APA
Leech G. &. S. J., . (1975). A communicative grammar of Engllish. Longman, London: .
Chicago
Leech Geoffrey & Svartvik Jan, . 1975. A communicative grammar of Engllish. Longman, London: .
Harvard
Leech G. &. S. J., . (1975). A communicative grammar of Engllish. Longman, London: .
MLA
Leech Geoffrey & Svartvik Jan, . A communicative grammar of Engllish. Longman, London: . 1975.