Callejón-Ferre, A., J. Pérez-Alonso, J. Sánchez-Hermosilla, and A. Carreño-Ortega. “Ergonomics and Psycho-Sociological Quality Indexes in Greenhouses, Almería (Spain)”. Spanish Journal of Agricultural Research, Vol. 7, no. 1, Mar. 2009, pp. 50-58, doi:10.5424/sjar/2009071-397.