Cita APA (7a ed.)
Alexander, L. G. (1991). Longman English grammar practice: For intermediate students (1.vyd.4.dotlač.). Longman Group UK.
Cita Chicago Style (17a ed.)
Alexander, Louis George. Longman English Grammar Practice: For Intermediate Students. 1.vyd.4.dotlač. Harlow: Longman Group UK, 1991.
Cita MLA (9a ed.)
Alexander, Louis George. Longman English Grammar Practice: For Intermediate Students. 1.vyd.4.dotlač. Longman Group UK, 1991.
Precaución: Estas citas no son 100% exactas.