San Diego, R. (1991). Walking into the valley of desolation. U.P. Newsletter.
Cita Chicago (17th ed.)San Diego, Rod. "Walking into the Valley of Desolation." U.P. Newsletter 1991.
Cita MLA (9th ed.)San Diego, Rod. "Walking into the Valley of Desolation." U.P. Newsletter, 1991.
Atenció: Aquestes cites poden no estar 100% correctes.