Horn S.P.  2007.  Late quaternary lake and swamp sediments: records of climate and environment. Central America: Geology, Resources, Hazards. 1:423-441.

Horn S.P.  2006.  Pre-Columbian maize agriculture in Costa Rice: Pollen and other evidence from lake and swamp sediments. Histories of Maize: Multidisciplinary Approaches to the Prehistory, Biogeography, Domestication, and Evolution of Maize. :367-380.

Anchukaitis K.J, Horn S.P.  2005.  A 2000-year reconstruction of forest disturbance from southern Pacific Costa Rica. Palaeogeography Palaeoclimatology Palaeoecology. 221(1-2):35-54.

Lane C.S, Horn S.P, Mora C.I.  2004.  Stable carbon isotope ratios in lake and swamp sediments as a proxy for prehistoric forest clearance and crop cultivation in the Neotropics. Journal of Paleolimnology. 32(4):375-381.