B S I. (1975). UDC 681.7 Optical apparatus and instruments and AMD 2710: 1975 BS 1000(681.7):1975. B S I.
Chicago Edition CitationB S I. UDC 681.7 Optical Apparatus and Instruments and AMD 2710: 1975 BS 1000(681.7):1975. London: B S I, 1975.
Cita MLAB S I. UDC 681.7 Optical Apparatus and Instruments and AMD 2710: 1975 BS 1000(681.7):1975. B S I, 1975.
Atenció: Aquestes cites poden no estar 100% correctes.