Martínez, L. M., I. V. Mayorga Coca, N. V. Mendoza Hernández, and G. Valdez Doña. “Quality of Sleep in Resident Doctors of HEODRA”. UNIVERSITAS (LEÓN): SCIENTIFIC JOURNAL OF THE UNAN-LEÓN, vol. 2, no. 2, Nov. 2008, pp. 13-17, doi:10.5377/universitas.v2i2.1648.