Gall, J. (1975). Systemantics: How systems work and especially how they fail. Quadrangle.
Cita Chicago (17th ed.)Gall, John. Systemantics: How Systems Work and Especially How They Fail. Nueva York: Quadrangle, 1975.
Cita MLA (9th ed.)Gall, John. Systemantics: How Systems Work and Especially How They Fail. Quadrangle, 1975.
Atenció: Aquestes cites poden no estar 100% correctes.