Shaffel, Fannie R., author
Prentice-Hall, 1967
Buku Teks
Dyah Triarini Indirasari, author
1997
UI - Skripsi (Membership)
This, Leslie E.
Addison-Wesley Pub. Co. , 1974
Buku Teks
Desy Christina, author
2000
UI - Skripsi (Membership)
Russell, Anne
Prentive-Hall, 1982
Buku Teks