Citazione Stile APA (7a Edizione)

O'Neill, R., & Kingsbury, R. Y. (1971). Kernel lessons intermediate: Students' book (21st imp.). Longman.

Citazione stile Chigago Style (17a edizione)

O'Neill, Robert, e Roy,. Yeadon Kingsbury. Kernel Lessons Intermediate: Students' Book. 21st imp. London: Longman, 1971.

Citatione MLA (9a ed.)

O'Neill, Robert, e Roy,. Yeadon Kingsbury. Kernel Lessons Intermediate: Students' Book. 21st imp. Longman, 1971.