Sloan, A
Hutchinson , 1924
Buku Teks
Lenczowski, George
Cornell University Press, 1956
Buku Teks
Ochsenwald, William
McGraw-Hill, 2011
Buku Teks
Fisher, Sydney Nettleton
Routledge & Kegan Paul, 1959
Buku Teks
Harari, Maurice
Prentice-Hall, 1962
Buku Teks