Nickell, Paulena
John Wiley & Sons, 1959
Buku Teks
Nickell, Paulena
Wiley Eastern, 1970
Buku Teks
Firth, Rosemary
Humanities Press, 1966
Buku Teks
Marsidin R.
Universitas Indonesia, 2002
UI - Tesis (Membership)
Swanson, Bettye B.
Macmillan, 1981
Buku Teks