1. Heighting and distance Accuracy of Digital Electronic Levels;Algarni;Journal of King Saud University (Engineering Sciences),1998
2. Accuracy of Modem Optical Theodolites in Tacheometric Surveys;Ali;The Surveying Technician,1993
3. Introduction to Surveying;Anderson,1985
4. Surveying;Bannister,1991
5. Elements of Plane Surveying;Benton,1991