APA (7th ed.) Citation

Gregory, B. A. (1973). An introduction to electrical instrumentation / (by) B.A. Gregory. Macmillan.

Chicago Style (17th ed.) Citation

Gregory, B. A. An Introduction to Electrical Instrumentation / (by) B.A. Gregory. London: Macmillan, 1973.

MLA (9th ed.) Citation

Gregory, B. A. An Introduction to Electrical Instrumentation / (by) B.A. Gregory. Macmillan, 1973.

Warning: These citations may not always be 100% accurate.