Preston, Paul, author
Dorsey Press, 1986
Buku Teks
Stockdale, James B., author
Stanford University, 1984
Buku Teks
Sandburg, Carl, author
Harcourt Brace, 1939
Buku Teks
Thompson, William Fletcher, 1929-, author
Louisiana State University Pres, 1994
Buku Teks
Laurence King, 2002
Buku Teks