APA-viite (7. p.)

Leech , G. ;. S.. (2012). Communicative Grammar Of English (3rd. ed.). Pearson Eduication.

Chicago-viite (17. p.)

Leech , Geaffrey ; Svartivk. Communicative Grammar Of English. 3rd. ed. New Delhi: Pearson Eduication, 2012.

MLA-viite (9. p.)

Leech , Geaffrey ; Svartivk. Communicative Grammar Of English. 3rd. ed. Pearson Eduication, 2012.