Underhill, S. (2000). Best of twins: Steven Underhill. Gmünder.
Cita Chicago (17th ed.)Underhill, Steven. Best of Twins: Steven Underhill. Berlin: Gmünder, 2000.
Cita MLA (8th ed.)Underhill, Steven. Best of Twins: Steven Underhill. Gmünder, 2000.
Atenció: Aquestes cites poden no estar 100% correctes.