Studies in recent years have focused heavily on teacher practice and analyzing textbooks and their contents. The schematic representation of the resource system can be used to analyze the composition of teachers' creation of the document. It is also thought to be an effective process for revealing their critical thinking dispositions. This study aims to determine whether teacher candidates reflect critical thinking dispositions to their schematic representation of the resource systems. The case study design, one of the qualitative research methods, was used in this study. The research was conducted with 26 third-year students from the mathematics department in the faculty of education. In this study, it has been revealed that teacher candidates reflect the resources and critical thinking dispositions they preferred in their schematic representations of resource systems. The five themes "truth-seeking", "open-minded", "analytic", "systematic" and "self-confidence" were found in the schematic presentation of mathematics teacher candidates' critical thinking dispositions. Also, it was noted that mathematics teacher candidates were more oriented towards digital resources, especially internet resources. As a result, this study showed the resources that affect the professional development of teacher candidates and the relationships between these resources and their critical thinking orientations by the schematic representation of the resource system.