1. Ajzen, I., & Fishbein, M. (1974). Factors influencing intentions and the intention behavior relation. Human Relations.
2. Ajzen, I., & Fishbein, M. (1980). Understanding attitudes and predicting social behavior. Prentice-Hall, Inc.
3. Alvarado C. L. (2014). Design of a didactic manual with the learning cycle _ in the management module _ sanitary and phytosanitary of species animals and vegetables for _ students of the first year of baccalaureate of the specialization of productions agropecuarias del colegio [design of a didactic manual with the learning cycle in the sanitary and phytosanitary management module of animal and vegetable species for the students of the first year of baccalaureate of the specialization of agricultural productions of the college]. https://n9.cl/o5xr0
4. Vínculos, redes y relaciones virtuales en el proceso de agremiación estudiantil de Trabajo Social en Colombia
5. University education and job training. An analysis from the opinion of the students;Álvarez Pérez P. R.;Paradigm,2009