"The Rocha Medal". International Society for Rock Mechanics. Retrieved 2021-07-31. https://isrm.net/page/show/137?tab=288
"Müller Award". International Society for Rock Mechanics. Retrieved 2021-07-31. https://isrm.net/page/show/137?tab=287
"Who We Are". Fed IGS. Retrieved July 31, 2021. https://geoengineeringfederation.org/who-we-are/