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* {{cite book |last =Engel| first = Konrad |title=Sperner Theory |publisher=Cambridge University Press |location =Cambridge, UK (et al.) |year=1997 |isbn =0-521-45206-6}}
* {{cite book |last1 =Kung| first1 = Joseph P. S.|last2 =Rota| first2 = Gian-Carlo| author-link2=Gian-Carlo Rota|last3 =Yan| author-link3=Catherine Yan| first3 = Catherine H.|title=Combinatorics: The Rota Way|title-link= Combinatorics: The Rota Way |publisher=Cambridge University Press |location =Cambridge, UK (et al.) |year=2009|isbn =978-0-521-73794-4}}
*{{citation
| last1 = Culberson | first1 = Joseph C.
| last2 = Rawlins | first2 = Gregory J. E.
| journal = Order
| pages = 361-374
| title = New results from an algorithm for counting posets
| url = https://link.springer.com/article/10.1007/BF00383201 | doi = 10.1007/BF00383201
| volume = 7
| year = 1990
}}
[[Category:Algebraic combinatorics]]
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