Cita APA (7a ed.)

O'Neill, R., Yeadon, T., & Kingsbury, R. (1971). Kernel lessons intermediate: Tests : students' book ([2nd. imp.].). Longman.

Cita Chicago Style (17a ed.)

O'Neill, Robert, Tony Yeadon, y Roy Kingsbury. Kernel Lessons Intermediate: Tests : Students' Book. [2nd. imp.]. London: Longman, 1971.

Cita MLA (9a ed.)

O'Neill, Robert, et al. Kernel Lessons Intermediate: Tests : Students' Book. [2nd. imp.]. Longman, 1971.