Cita APA (7th ed.)

O'Neill, R. (1985). Kernel one: Students' book (15a. ed.). Longman.

Cita Chicago (17th ed.)

O'Neill, Robert. Kernel One: Students' Book. 15a. ed. New York: Longman, 1985.

Cita MLA (9th ed.)

O'Neill, Robert. Kernel One: Students' Book. 15a. ed. Longman, 1985.