Peñarrieta, M. I., Gutiérrez, T., González, N., Martínez, N., & González, G. (2006). Senior citizens, a pending issue. Universidad Autónoma de Tamaulipas.
Chicago Style (17. basım) AtıfPeñarrieta, María Isabel, Tranquilina Gutiérrez, Nora González, Norma Martínez, ve Gloria González. Senior Citizens, a Pending Issue. Universidad Autónoma de Tamaulipas, 2006.
MLA (8th ed.) AtıfPeñarrieta, María Isabel, et al. Senior Citizens, a Pending Issue. Universidad Autónoma de Tamaulipas, 2006.
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