Article in journal: Guigueno, Vincent (2005). ‘Engineering the Words: Robert Louis Stevenson and the Bell Rock Lighthouse’. The Yale University Library Gazette, Vol.80, No. 1/2: p.57-64.
Book: Dobson, E. (1850). A Rudimentary Treatise on Foundations and Concrete Works: Containing a Synopsis of the Principal Cases of Foundation Works. London: J. Weale, p.7.
INTERNET ARCHIVE: https://archive.org/details/bub_gb_bTPF9eXwDmQC/page/n15/mode/2up?q=A+narrative+of+the+building+and+the+description+of+the+construction+of+the+Edystone+Lighthouse+with+stone