ScienceDirect (Online service), Sommerfeld, A., & Straus, E. G. (1967). Partial differential equations in physics: Lectures on theoretical physics. Academic Press.
Chicago Style (17th ed.) CitationScienceDirect (Online service), Arnold Sommerfeld, and Ernst G. Straus. Partial Differential Equations in Physics: Lectures on Theoretical Physics. New York: Academic Press, 1967.
MLA (9th ed.) CitationScienceDirect (Online service), et al. Partial Differential Equations in Physics: Lectures on Theoretical Physics. Academic Press, 1967.
Warning: These citations may not always be 100% accurate.