This dataset raw source can be found at allenai's Github.
If you use this dataset, it is best to cite the original paper
@article{entalmentbank2021,
title={Explaining Answers with Entailment Trees},
author={Dalvi, Bhavana and Jansen, Peter and Tafjord, Oyvind and Xie, Zhengnan and Smith, Hannah and Pipatanangkura, Leighanna and Clark, Peter},
journal={EMNLP},
year={2021}
}