Reference Books:
1) Engineering Surveying 3rd Edition by W. Schofield
2) Engineering Surveying, Sixth Edition by W.Schofield and Mark Breach
3) Elementary Surveying Eight Edition by Paul R. Wolf and Russell C. Brinker
4) Surveying by B.C. Punmi
5) Engineering Surveying by Besavilla
6) Surveying principles and applications by Barry F. Kavanagh and S.J. Glenn Bird 5th edition.
Internet References:
AUTOLEVEL
https://civiltoday.com/surveying/92-advantages-and-disadvantages-of-auto-level
https://sl-iitr.vlabs.ac.in/exp1/index.php?section=Various%20Parts%20of%20Auto%20Level
http://www.johnsonlevel.com/News/AutomaticLevelsAllAboutAu
http://www.levelling.uhi.ac.uk/tutorial1_4.html
http://www.levelling.uhi.ac.uk/tutorial1_5.html
https://www.slideshare.net/vedprakashmarlapalle/levelling-65367175
https://acwi.gov/monitoring/conference/2016/2_wednesday_may4/E9F9/ElevationSurvey_secure.pdf
PLANIMETER
https://mechstation.com/how-to-use-a-planimeter-its-parts/
https://www.scribd.com/doc/52417031/planimeter-1
https://www.scribd.com/document/39863379/planimeter
SPIRIT LEVEL
https://www.tools4wood.co.za/how-to-guides/how-to-use-a-spirit-level/
http://www.johnsonlevel.com/News/SpiritLevelInformation
THEODOLITE:
http://www.johnsonlevel.com/News/TheodolitesAllAboutTheodo
https://theconstructor.org/surveying/theodolite-parts-functions-surveying/14761/
http://surveying2012.blogspot.com/2014/01/classifications-of-theodolites.html
https://readcivil.com/essential-transit-theodolite-parts-surveying/
https://civilseek.com/theodolite-parts-and-functions/
TOTAL STATION:
https://www.linkedin.com/pulse/behind-scenes-look-components-total-station-derrick-koome
https://theconstructor.org/surveying/total-station-operation-uses-advantage/6605/
https://sciencing.com/use-total-station-5011000.html