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• http://repository.cesa.edu.co/handle/10726/3409
• http://repository.cesa.edu.co/handle/10726/159
• http://repository.cesa.edu.co/handle/10726/870
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• http://repository.cesa.edu.co/handle/10726/1912
• http://repository.cesa.edu.co/handle/10726/3502
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• http://repository.cesa.edu.co/handle/10726/2892
• http://repository.cesa.edu.co/handle/10726/524
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• http://repository.cesa.edu.co/handle/10726/1814
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• http://repository.cesa.edu.co/handle/10726/1914
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• http://repository.cesa.edu.co/handle/10726/3277
• http://repository.cesa.edu.co/handle/10726/916