Mullins, R. K., & Cooper, D. A. (1972). Programmed technical drawing: SI units. Hutchinson.
Cita Chicago (17th ed.)Mullins, R. K., i D. A. Cooper. Programmed Technical Drawing: SI Units. London: Hutchinson, 1972.
Cita MLA (9th ed.)Mullins, R. K., i D. A. Cooper. Programmed Technical Drawing: SI Units. Hutchinson, 1972.
Atenció: Aquestes cites poden no estar 100% correctes.