Allen, Clark Lee, author
Wadsworth, 1967
Buku Teks
Beckwith, Burnham Putnam, author
Columbia University Press, 1955
Buku Teks
Najibullah, author
2017
UI - Tesis (Membership)
Dorfman, Robert, author
Prentice-Hall, 1965
Buku Teks
Chamberlin, Edward Hastings, author
Harvard University Press, 1946
Buku Teks