Smithin, John
Edward Elgar, 2003
Buku Teks SO
Kurihara, Kenneth K.
Allen & Unwin, 1951
Buku Teks SO
Chacholiades, Miltiades
McGraw-Hill, 1978
Buku Teks SO
Hansen, Alvin Harvey, 1887-1975
McGraw-Hill, 1949
Buku Teks
Walsh, Carl E.
MIT Press, 2010
Buku Teks SO