Gibbons, J. (2000). Generic downwards accumulations. Elsevier.
Cita Chicago (17th ed.)Gibbons, J. Generic Downwards Accumulations. Elsevier, 2000.
Cita MLA (9th ed.)Gibbons, J. Generic Downwards Accumulations. Elsevier, 2000.
Atenció: Aquestes cites poden no estar 100% correctes.