Sloan, A
Hutchinson , 1924
Buku Teks
Lenczowski, George, author
Cornell University Press, 1956
Buku Teks
Routledge & Kegan Paul, 1958
Buku Teks
Harari, Maurice, author
Prentice-Hall, 1962
Buku Teks
Ochsenwald, William, author
McGraw-Hill, 2011
Buku Teks