O'Neill, R., Kingsbury, R., & Yeadon, T. (1970). Kernel lessons intermediate: Teacher's book. Longman.
Cita Chicago Style (17a ed.)O'Neill, Robert, Roy Kingsbury, y Tony Yeadon. Kernel Lessons Intermediate: Teacher's Book. London: Longman, 1970.
Cita MLA (9a ed.)O'Neill, Robert, et al. Kernel Lessons Intermediate: Teacher's Book. Longman, 1970.
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