Cita APA (7th ed.)

O'Neill, R., Kingsbury, R., & Yeadon, T. (1971). Kernel lessons intermediate: Student's book. Longman Group Limited.

Cita Chicago (17th ed.)

O'Neill, Robert, Roy Kingsbury, i Tony Yeadon. Kernel Lessons Intermediate: Student's Book. Londres: Longman Group Limited, 1971.

Cita MLA (9th ed.)

O'Neill, Robert, et al. Kernel Lessons Intermediate: Student's Book. Longman Group Limited, 1971.