Barker, A. C. (1975). Degree Mathematical Tutor. Macdonald & Evans.
Cita Chicago (17th ed.)Barker, A. C. Degree Mathematical Tutor. London: Macdonald & Evans, 1975.
Cita MLA (9th ed.)Barker, A. C. Degree Mathematical Tutor. Macdonald & Evans, 1975.
Atenció: Aquestes cites poden no estar 100% correctes.