Cita APA (7a ed.)

Open University. (1986). Open Learning. Longman Group.

Cita Chicago Style (17a ed.)

Open University. Open Learning. Essex, Inglaterra: Longman Group, 1986.

Cita MLA (8a ed.)

Open University. Open Learning. Longman Group, 1986.

Precaución: Estas citas no son 100% exactas.