Cita APA

Walford, A. J., & Walford, A. J. (1975). Guide to reference material (3. edition.). London: Library Association.

Citación estilo Chicago

Walford, Albert John, y Albert John Walford. Guide to Reference Material. 3. edition. London: Library Association, 1975.

Cita MLA

Walford, Albert John, y Albert John Walford. Guide to Reference Material. 3. edition. London: Library Association, 1975.