Citazione APA

Summers, D. (2012). Longman dictionary of contemporary English (6th ed.). Longman.

Stile di citazione Chicago

Summers, Della. Longman Dictionary of Contemporary English. 6th ed. Harlow, Essex, England: Longman, 2012.

Citazione MLA

Summers, Della. Longman Dictionary of Contemporary English. 6th ed. Longman, 2012.