Ludwig, Gunter
Pergamon Press, 1968
Buku Teks
Sorensen, Robert M.
John Wiley & Sons, 1993
Buku Teks
Sears, Francis Weston, 1898-1975
Addison-Wesley, 1958
Buku Teks
Brandt, Siegmund
[Springer, ], 2012
eBooks
Krynine, Dimitri P.
McGraw-Hill, 1947
Buku Teks