Hanke, John E., author
Prentice Halls, 2001
Buku Teks
Hanke, Jonh E., author
Pearson Prentice Hall, 2005
Buku Teks
Bratt, Elmer C., author
McGraw-Hill, 1958
Buku Teks
Hansen, Alvin H. (Alvin Harvey), 1887-1975, author
W.W. Norton, 1951
Buku Teks
Hansen, Alvin H. (Alvin Harvey), 1887-1975, author
W.W. Norton, 1941
Buku Teks