Exell, Joseph S.; Spence-Jones, Henry Donald Maurice (Editors). On "1 Kings 7". In: The Pulpit Commentary. 23 volumes. First publication: 1890. Accessed 24 April 2019.
Munk, Matityahu Hacohen. Three Geometric Problems in the Bible and Talmud. Sinai51 (1962), 218-227 (in Hebrew); Munk, Matityahu Hacohen. The Halachic Way in Solving Special Geometric Problems. Hadarom27 (1968), 115-133 (in Hebrew). Cited i: Tsaban, Boaz; Garber, David. On the Rabbinical Approximation of Pi, Historia Mathematica 25 (1998), pp. 75-84.
Missler, Chuck. The Value of Pi: Hidden Codes in the Bible. April 1, 1998. This finding was also reported by Shlomo Edward G. Belaga, in the page by Boaz Tsaban "Rabbinical Math" and in the book by Grant Jeffrey, "The Handwriting of God", Frontier Research Publications, Toronto Ontario, 1997.