Allen, W. (1959). Living English structure (4th.). Orient Longmans.
Lua i Stíl Chicago (17ú heag.)Allen, W. Living English Structure. 4th. Bombay: Orient Longmans, 1959.
Lua MLA (9ú heag.)Allen, W. Living English Structure. 4th. Orient Longmans, 1959.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.