Cita APA (7a ed.)

O'Neill, R. A., & Mugglestone, P. (1987). The Fourth Dimension. Coursebook. Longman.

Cita Chicago Style (17a ed.)

O'Neill, Robert. Autor, y Patricia Mugglestone. The Fourth Dimension. Coursebook. Essex: Longman, 1987.

Cita MLA (9a ed.)

O'Neill, Robert. Autor, y Patricia Mugglestone. The Fourth Dimension. Coursebook. Longman, 1987.