1. The Psycho-biology of Language: An Introduction to Dynamic Philology;Zipf,1936
2. Spanische Lautdauer. Eine experimentelle Untersuchunge;Menzerath,1928
3. Quantitative Linguistics: An International Handbook;Köhler,2005
4. Human Behavior and the Principle of Least Effort;Zipf,1949
5. Die Architektonik des Deutschen Wortschatzes;Menzerath,1954