Learning styles models are used for modeling the way the students learn in adaptive e-learning systems. Felder and Silverman Learning Styles Model is the most widely used learning styles model in the literature and it is also recommended as the most suitable model to be used in adaptive e-learning systems. Therefore, students are modeled by using the Felder and Silverman Learning Styles Model in many studies in the literature. On the other hand, Semantic Web technology enables semantic representations of different domains in a machine readable format that increases reusability of the proposed representations. These semantic representations are stored as ontologies that provide the basic vocabulary for a specific domain. Interoperability of various systems can also be provided by using the semantic representations in ontologies. Semantic Web technology is frequently used in the e-learning field as well. Students, teachers, institutions, learning materials and other components of adaptive e-learning systems are represented semantically by using ontologies. Different learning styles models are also modeled with ontologies as part of the student/learner models in adaptive e-learning systems. In this paper, we focus on the Felder and Silverman Learning Styles Model and provide a review of different semantic representations of it present in the literature. As a result, it is concluded that there is no right way to model the Felder and Silverman Learning Styles Model in an ontology. Therefore, it can be modeled in different ways in different ontologies depending on the requirements of the e-learning system it is used in.