Heather, J. F. (1888). Drawing and measuring instruments. Crosby Lockwood and son.
Cita Chicago (17th ed.)Heather, J. F. Drawing and Measuring Instruments. London: Crosby Lockwood and son, 1888.
Cita MLA (9th ed.)Heather, J. F. Drawing and Measuring Instruments. Crosby Lockwood and son, 1888.
Atenció: Aquestes cites poden no estar 100% correctes.