Sommerville, D. M. Y. (1958). The elements of non-Euclidean geometry. Dover.
Chicago Style (17th ed.) CitationSommerville, Duncan M'Laren Young. The Elements of Non-Euclidean Geometry. New York: Dover, 1958.
MLA (9th ed.) CitationSommerville, Duncan M'Laren Young. The Elements of Non-Euclidean Geometry. Dover, 1958.