1. 1. Brajesh Mishra1, Ravi Shanker Mishra2 (2015) A Study on Use of Industrial Wastes in Rural Road Construction, International Journal of Innovative Research in Science, Engineering and Technology DOI:10.15680/IJIRSET.2015.0411009.
   2. Angelina M. Y. Ho, Hawa Ze Jaafar, Ionel Valeriu Grozescu, and Muhammad Zaharul Asyraf Bin Zaharin (2015) Solar Powered Gravity-Feed Drip Irrigation System Using Wireless Sensor Network DOI: 10.7763/IJESD.2015.V6.731
   3. O. A. Cuzman, L. Wittig, F. J. Royo Abancéns, C. Herrera, N. R. Anastasi, and L. Sánchez Alonso (2015) Bacterial “Masons” at Work with Wastes for Producing Eco-cement DOI: 10.7763/IJESD.2015.V6.696
   4. Rungruang Janta, Somporn Chantara, Angkhana Inta, Munetsugu Kawashima, and Kenichi Satake (2016) Levels of Road Traffic Heavy Metals in Tree Bark Layers of Cassia fistula Tree DOI: 10.7763/IJESD.2016.V7.805
   5. Xiaochun Qin,1,2 Qingchao Wei,1,2 Lianjun Wang,1,2 and Yi Shen3 (2015) Solar Lighting Technologies for Highway Green Rest Areas in China: Energy Saving Economic and Environmental Evaluation Article ID 926235
   6. Ministry of Road Transport and Highways Document, NHAI website