1. Hierarchy Theory: A Vision, Vocabulary, and Epistemology;Ahl,1996
2. Graphemic and syllabic length of words in text and vocabulary;Alekseev;Journal of Quantitative Linguistics,1998
3. Allen, T.F., 2001. A summary of the principles of hierarchy theory. Available at: https://web3.isss.org/projects/doku.php?id=a_summary_of_the_principles_of_hierarchy_theory, accessed 2/18/2023.
4. Bibliography: Menzerath s law;Altmann;Glottotheory,2014
5. Prolegomena to Menzerath's law;Altmann;Glottometrika,1980