O'Neill, R. (1985). Kernel one: Students' book (15a. ed.). Longman.
Cita Chicago Style (17a ed.)O'Neill, Robert. Kernel One: Students' Book. 15a. ed. New York: Longman, 1985.
Cita MLA (9a ed.)O'Neill, Robert. Kernel One: Students' Book. 15a. ed. Longman, 1985.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.