Cita APA (7a ed.)

O'Neill, R. A., & Muggleston, P. (1990). Fourth Dimension. Course book. Longman.

Cita Chicago Style (17a ed.)

O'Neill, Robert. Autor, y Patricia Muggleston. Fourth Dimension. Course Book. Essex: Longman, 1990.

Cita MLA (9a ed.)

O'Neill, Robert. Autor, y Patricia Muggleston. Fourth Dimension. Course Book. Longman, 1990.