Fjeldstad, Mary C., author
Harcourt Brace College Publisher, 1998
Buku Teks
Hammond, Eugene R., author
McGraw-Hill, 1989
Buku Teks
Seedhouse, David, author
Sage Publications, 2019
eBooks
edited by Kenneth G. Elzinga
Harper & Row, 1972
Buku Teks
Voltaire, 1694-1778
New York Dell 1959
Buku Teks