Nievergelt, Yves (2002), Foundations of Logic and Mathematics: Applications to Computer Science and Cryptography, Springer-Verlag, tr. 158.
cuni.cz
karlin.mff.cuni.cz
Flaška, V.; Ježek, J.; Kepka, T.; Kortelainen, J. (2007). Transitive Closures of Binary Relations I(PDF). Prague: School of Mathematics – Physics Charles University. tr. 1. Bản gốc(PDF) lưu trữ ngày 2 tháng 11 năm 2013. Lemma 1.1 (iv). This source refers to asymmetric relations as "strictly antisymmetric".
Mäs, Stephan (2007), “Reasoning on Spatial Semantic Integrity Constraints”, Spatial Information Theory: 8th International Conference, COSIT 2007, Melbourne, Australia, September 19–23, 2007, Proceedings, Lecture Notes in Computer Science, 4736, Springer, tr. 285–302, doi:10.1007/978-3-540-74788-8_18
Flaška, V.; Ježek, J.; Kepka, T.; Kortelainen, J. (2007). Transitive Closures of Binary Relations I(PDF). Prague: School of Mathematics – Physics Charles University. tr. 1. Bản gốc(PDF) lưu trữ ngày 2 tháng 11 năm 2013. Lemma 1.1 (iv). This source refers to asymmetric relations as "strictly antisymmetric".