Greenberg, K. H., Sohn, B. K., Greenberg, N., Pollio, H. R., Thomas, S. P., & Smith, J. T. (2019). The Phenomenological Heart of Teaching and Learning: Theory, Research, and Practice in Higher Education. Routledge ISBN-13: 978-0815371830, ISBN-10: 0815371837
Stoitsova, T., Snellen, A., & Pollio, H. R. (2011). Life and Death in a Time of Terror. New Bulgarian University Press. ISBN-10: 9545356685, ISBN-13: 978-9545356681