- Wozniak, S., DeHart, G., Bishop, A., Hoxie, A., & Fabiano, G. (1998, July). Competition and cooperation between siblings and friends. Poster presented at the biennial meeting of the International Society for the Study of Behavioural Development, Berrie, Switzerland.
- DeHart, G., Kucharczak, K., Lim, K., Ghazanfari, S., Duffy, L., & Johnson, S. (1998, May). Social engagement and sibling and friend conflict in early and middle childhood. Poster presented at the annual conference of the American Psychology Society, Washington, DC.
- DeHart, G., Wozniak, S., Hoxie, A., Tobin, K., Sibley, E., Bishop, A., & Fabiano, G. (1998, March). Social engagement with siblings and friends in early and middle childhood. Poster presented at the Conference on Human Development, Mobile, AL.