Citazione Stile APA (7a Edizione)

Firth, C. B. (1949). History (Second series, teachers' book, 1. publ., 2. impression.). Ginn.

Citazione stile Chigago Style (17a edizione)

Firth, Catherine B. History. Second series, teachers' book, 1. publ., 2. impression. London: Ginn, 1949.

Citatione MLA (9a ed.)

Firth, Catherine B. History. Second series, teachers' book, 1. publ., 2. impression. Ginn, 1949.