Frye, F. H., Baxter, S. D., Litaker, M. S., Thompson, W. O., Guinn, C. H., Baglio, M. L., & Shaffer, N. M. (2003). Differences in Fourth-Graders' Participation Rates Across Four School-Based Nutrition Studies.

Frye, Francesca H.A., Suzanne Domel Baxter, Mark S. Litaker, William O. Thompson, Caroline H. Guinn, Michelle L. Baglio, et Nicole M. Shaffer. Differences in Fourth-Graders' Participation Rates Across Four School-Based Nutrition Studies. 2003.

Frye, Francesca H.A., et al. Differences in Fourth-Graders' Participation Rates Across Four School-Based Nutrition Studies. 2003.