Robertson, D.H., author
Staples Press, 1948
Buku Teks
Harris, Laurence, author
McGraw-Hill, 1985
Buku Teks
Newlyn, W.T., author
Oxford University Press, 1962
Buku Teks
Niehans, Jurg, author
John Hopkins University Press, 1980
Buku Teks
Rosen, Lawrence R., author
Dow Jones-Irwin, 1974
Buku Referensi