Ryder, John D.
McGraw-Hill, [date of publication not identified]
Buku Teks
Watson, John, author
Macmillan, 1990
Buku Teks
Bureau of Naval Personnel
Coles, 1980
Buku Teks
Seely, Samuel, author
McGraw-Hill, 1956
Buku Teks
Ramey, Robert L.
Belmont: Wadsworth, 1963
Buku Teks