Cita APA (7a ed.)

O'Neill, R., & Woolford, C. (1982). Kernel two: Student's book.

Cita Chicago Style (17a ed.)

O'Neill, Robert, y Claire Woolford. Kernel Two: Student's Book. Harlow, 1982.

Cita MLA (9a ed.)

O'Neill, Robert, y Claire Woolford. Kernel Two: Student's Book. 1982.