| Are challenge (ropes) courses an effective tool? A meta-analysis HL Gillis, E Speelman Journal of Experiential Education 31 (2), 111-135, 2008 | 190 | 2008 |
| A meta-analysis of wilderness therapy outcomes for private pay clients JE Bettmann, HL Gillis, EA Speelman, KJ Parry, JM Case Journal of Child and Family Studies 25, 2659-2673, 2016 | 117 | 2016 |
| Meta-Analysis of Treatment Outcomes Measured by the Y-OQ and Y-OQ-SR Comparing Wilderness and Non-Wilderness Treatment Programs J Gillis, H.L., Speelman, E., Linville, N., Bailey, E., Kalle, A., Oglesbee ... Child & Youth Care Forum, 2016 | 50 | 2016 |
| Adventure leadership and experiential education EA Speelman, M Wagstaff New Directions for Student Leadership 2015 (147), 89-98, 2015 | 12 | 2015 |
| Challenge course meta-analyses EA Speelman University of Georgia, 2013 | 4 | 2013 |
| Aerial adventure environments: The theory and practice of the challenge course, zip line, and canopy tour industry EA Speelman, M Wagstaff, SH Jordan, K Haras Human Kinetics, 2020 | 2 | 2020 |
Harold L. "Lee" Gillis, Jr.Georgia College & State UniversityVerified email at gcsu.edu
Harold L. "Lee" Gillis, Jr.Georgia College & State UniversityVerified email at gcsu.edu