CHENG, Eugenia. Beyond infinity : an expedition to the outer limits of the mathematical universe. First published in Great Britain. London : Profile books, 2017. 1 online zdroj (284 stran). Dostupné na internetu: <http://search.ebscohost.com/login.aspx?direct=true&db=nlebk&AN=1479647&lang=cs&site=eds-live&ebv=EK&ppid=Page-__-1> ISBN 978-1-78283-081-8.