Cita APA (7a ed.)

O'Neill, R., & Kingsbury, R. (1974). Kernel lessons Plus: A post-intermediate course : tests : teacher's book. Longman.

Cita Chicago Style (17a ed.)

O'Neill, Robert, y Roy Kingsbury. Kernel Lessons Plus: A Post-intermediate Course : Tests : Teacher's Book. London: Longman, 1974.

Cita MLA (9a ed.)

O'Neill, Robert, y Roy Kingsbury. Kernel Lessons Plus: A Post-intermediate Course : Tests : Teacher's Book. Longman, 1974.