| 1 | ||
| Researcher: | Harbhajan Singh | |
| Guide: | Pathak, K N | |
| University: | Panjab University | |
| Language: | English | |
| Shodhganga | ||
| 2 | ||
| Researcher: | Harbhajan Singh | |
| Guide: | Singh, R D | |
| University: | Kurukshetra University | |
| Language: | English | |
| 3 | ||
| Researcher: | Harbhajan Singh | |
| University: | Indian Institute of Technology | |
| Language: | English | |