Velásquez, M., Castillo, M.A., De León, E., López, L., Blanco, L., Aragón, A., Partanen, T., Wesseling, C., Monge, P., Mergler, D., Messing, K., Bernstein, S., De Grosbois, S., Seifert, A.M. (2004). Gender Based Health Standards for Workers in Maquilas and Flower Cultivation in Central America. Phase 1: Conceptual Framework and Evaluation of Methods for Data Collection. Heredia, Costa Rica: Series Informes Técnicos IRET N°1. ISBN 9968-924-00-8.