Books:

1. D. Patranabis, "Sensors and Transducers"
2. A. K. Shawney, "A course in Mechanical Measurements and Instrumentation"
3. Bela G. Liptak, "Instrument Engineers' Handbook: Process Measurement and Analysis"
4. Doeblin, "Measurement Systems Applications and Design"
5. B. L. Theraja and A. K. Theraja, "A Textbook of Electrical Technology"
6. John Bird, "Electrical and Electronic Principles and Technology"

Useful links:

1. https://www.rdpe.com/displacement/lvdt/lvdt-principles.htm
2. https://www.te.com/usa-en/industries/sensor-solutions/insights/lvdt-tutorial.html
3. https://www.efunda.com/designstandards/sensors/lvdt/lvdt_theory.cfm
4. https://www.engineersedge.com/instrumentation/lvdt_linear_voltage_displacment_tranducer.htm