Core sources by Bradford’s law
| Sources | Rank | Frequency | Cumulative frequency | Zone |
|---|---|---|---|---|
| Sustainability | 1 | 1,131 | 1,131 | Zone 1 |
| Journal of Cleaner Production | 2 | 256 | 1,387 | Zone 1 |
| Sustainable Development | 3 | 174 | 1,561 | Zone 1 |
| Environmental Science and Pollution Research | 4 | 134 | 1,695 | Zone 1 |
| Environment Development and Sustainability | 5 | 101 | 1,796 | Zone 1 |
| International Journal of Sustainability in Higher Education | 6 | 96 | 1,892 | Zone 1 |
| Science of the Total Environment | 7 | 86 | 1,978 | Zone 1 |
| Journal of Environmental Management | 8 | 77 | 2,055 | Zone 1 |
| Sustainability Science | 9 | 68 | 2,123 | Zone 1 |
| Energies | 10 | 66 | 2,189 | Zone 2 |
| Land | 11 | 63 | 2,252 | Zone 2 |
| Plos One | 12 | 62 | 2,314 | Zone 2 |
| Heliyon | 13 | 57 | 2,371 | Zone 2 |
| Remote Sensing | 14 | 56 | 2,427 | Zone 2 |
| International Journal of Environmental Research and Public Health | 15 | 55 | 2,482 | Zone 2 |
| Resources Policy | 16 | 50 | 2,532 | Zone 2 |
| International Journal of Sustainable Development and World Ecology | 17 | 45 | 2,577 | Zone 2 |
| Water | 18 | 43 | 2,620 | Zone 2 |
| Business Strategy and the Environment | 19 | 42 | 2,662 | Zone 2 |
| Sources | Rank | Frequency | Cumulative frequency | Zone |
|---|---|---|---|---|
| 1 | 1,131 | 1,131 | Zone 1 | |
| 2 | 256 | 1,387 | Zone 1 | |
| 3 | 174 | 1,561 | Zone 1 | |
| 4 | 134 | 1,695 | Zone 1 | |
| 5 | 101 | 1,796 | Zone 1 | |
| 6 | 96 | 1,892 | Zone 1 | |
| 7 | 86 | 1,978 | Zone 1 | |
| 8 | 77 | 2,055 | Zone 1 | |
| 9 | 68 | 2,123 | Zone 1 | |
| 10 | 66 | 2,189 | Zone 2 | |
| 11 | 63 | 2,252 | Zone 2 | |
| 12 | 62 | 2,314 | Zone 2 | |
| 13 | 57 | 2,371 | Zone 2 | |
| 14 | 56 | 2,427 | Zone 2 | |
| 15 | 55 | 2,482 | Zone 2 | |
| 16 | 50 | 2,532 | Zone 2 | |
| 17 | 45 | 2,577 | Zone 2 | |
| 18 | 43 | 2,620 | Zone 2 | |
| 19 | 42 | 2,662 | Zone 2 |
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