O'Neill, R., Kingsbury, R., & Yeadon, T. (1971). Kernel lessons intermediate: Student's book. Longman Group Limited.
Chicago-čujuhus (17. p.)O'Neill, Robert, Roy Kingsbury, juo Tony Yeadon. Kernel Lessons Intermediate: Student's Book. Londres: Longman Group Limited, 1971.
MLA-čujuhus (9. p.)O'Neill, Robert, et al. Kernel Lessons Intermediate: Student's Book. Longman Group Limited, 1971.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.