Parks, Lillian Rogers
Fleet Publishing , 1961
Buku Teks
Sandburg, Carl, author
Harcourt Brace, 1939
Buku Teks
Schlesinger, Arthur Meier, author
Fawcett Publications, 1965
Buku Teks
Fersh, Seymour H., author
Public Affairs, 1961
Buku Teks
Stockdale, James B., author
Stanford University, 1984
Buku Teks