Brogan, D.W. (Denis William), author
Harcourt, Brace & World, 1963
Buku Teks
Chilcote, Ronald H., author
Routledge, 2000
eBooks
Curtis, Michael, author
Harper & Row, 1978
Buku Teks
Powell, G. Bingham, author
Pearson Education, 2015
Buku Teks
Kesselman, Mark, author
Wadsworth and Cengage Learning, 2013
Buku Teks