@book{anderson_stubbs_2000, title={Algae: A sourcebook for teaching about harmful algal blooms}, ISBN={0787270148}, publisher={Dubuque, IA: Kendall/Hunt}, author={Anderson, N. D. and Stubbs, H. S.}, year={2000} }
 @book{anderson_stubbs_peck_slusher_1999, title={Ants: Using biological indicators to investigate environmental conditions}, ISBN={0892780088}, publisher={Raleigh, NC: SCI-LINK/GLOBE-NET Projects, North Carolina State University; Burlington, N.C.: Carolina Biological Supply Co.}, author={Anderson, N. D. and Stubbs, H. S. and Peck, S. L. and Slusher, J. W.}, year={1999} }
 @book{stubbs_klinkhammer_anderson_knittig_1998, title={Acid rain: Grades 4-8, a sourcebook for teaching about a major environmental problem}, ISBN={078723429X}, publisher={Dubuque, Iowa: Dubuque, Iowa}, author={Stubbs, H. S. and Klinkhammer, M. L. and Anderson, N. D. and Knittig, M.}, year={1998} }
 @book{hessler_stubbs_anderson_1998, title={Acid rain: Grades 6-12, a sourcebook for teaching about a major environmental problem}, ISBN={0787234303}, publisher={Dubuque, Iowa: Kendall/Hunt}, author={Hessler, E. W. and Stubbs, H. S. and Anderson, N. D.}, year={1998} }
 @book{anderson_stubbs_1997, title={Clover: Investigating the effects of tropospheric ozone}, ISBN={0892780002}, publisher={Raleigh, NC : SCI-LINK/GLOBE-NET, North Carolina State University; Burlington, NC: Carolina Biological Supply Co.}, author={Anderson, N. D. and Stubbs, H. S.}, year={1997} }