Young, Harold A.
Buckley Press, 1957
Buku Teks
Setia Pertiwi, author
2001
UI - Tesis (Membership)
Morton, Gene A.
Fishergate, 1986
Buku Teks
Huebner, S. S., author
Appleton-Century Crafts, 1958
Buku Teks
Black, Kenneth, author
Prentice-Hall, 1994
Buku Teks