singer, h. w. (1962). choic of technology. the institute of national planning.
Cita Chicago (17th ed.)singer, h. w. Choic of Technology. cairo: the institute of national planning, 1962.
Cita MLA (9th ed.)singer, h. w. Choic of Technology. the institute of national planning, 1962.
Atenció: Aquestes cites poden no estar 100% correctes.