Webster, Hutton, author
D.C. Heath, 1947
Buku Teks
Hoffman, Ross J.S., author
Littlefield, Adams, 1958
Buku Teks
Hoffding, Harold, author
Dover, 1955
Buku Teks
Cobban, Alfred, author
Braziller, 1965
Buku Teks
Hauser, Arnold, author
Alfred A. Knopf , 1952
Buku Teks