Potten, A.J. van, author
Rabobank International Group, 1996
Buku Teks
Kahin, George McTurnan, author
Dial Press , 1967
Buku Teks
Rowe, John, author
Time-Life Books, 1987
Buku Teks
Bodard, Lucien, author
Atlantic Monthly Press Book, 1967
Buku Teks
Hughes, Richard L., author
McGraw-Hill, 2012
Buku Teks