Ewing, G. M. (1969). Calculus of variations with applications. Norton W. W..
Chicago Style (17th ed.) CitationEwing, George McNaught. Calculus of Variations with Applications. New York: Norton W. W., 1969.
MLA (9th ed.) CitationEwing, George McNaught. Calculus of Variations with Applications. Norton W. W., 1969.