Cita APA (7a ed.)

O'Neill, R. J., Kingsbury, R., & Yeadon, T. (1980). Kernel lesons intermediate: Student's book ([1st ed., 21st impr.].). Longman.

Cita Chicago Style (17a ed.)

O'Neill, Robert John, Roy Kingsbury, y Tony Yeadon. Kernel Lesons Intermediate: Student's Book. [1st ed., 21st impr.]. London: Longman, 1980.

Cita MLA (9a ed.)

O'Neill, Robert John, et al. Kernel Lesons Intermediate: Student's Book. [1st ed., 21st impr.]. Longman, 1980.