Simovici, Dan A. & Djeraba, Chabane (2008). "Partially Ordered Sets". Mathematical Tools for Data Mining: Set Theory, Partial Orders, Combinatorics. Springer. ISBN9781848002012.
Flaška, V.; Ježek, J.; Kepka, T.; Kortelainen, J. (2007). "Transitive Closures of Binary Relations I". Acta Universitatis Carolinae. Mathematica et Physica (Prague: School of Mathematics – Physics Charles University) 48 (1): 55–69. http://dml.cz/dmlcz/142762. Lemma 1.1 (iv). This source refers to asymmetric relations as "strictly antisymmetric".