Citazione Stile APA (7a Edizione)

Harkness, D. (1983). Northern Ireland since 1920 (1. publ.). Helicon.

Citazione stile Chigago Style (17a edizione)

Harkness, David. Northern Ireland Since 1920. 1. publ. Dublin: Helicon, 1983.

Citatione MLA (9a ed.)

Harkness, David. Northern Ireland Since 1920. 1. publ. Helicon, 1983.