APA Style

Director, D, S., Summers, D. (1994). Longman Language Activator = The World's First Production Dictionary (พิมพ์ครั้งที่ 1). : Longman Group UK Limited.

MLA Style

Director, Della, Summers,., Summers, Della. "Longman Language Activator = The World's First Production Dictionary". พิมพ์ครั้งที่ 1 : Longman Group UK Limited, 1994. .