Gunther, John, 1901-1970, author
Harper & Brothers, 1960
Buku Teks
Ballast, David Kent, author
Prentice-Hall, 1986
Buku Referensi
Schweitzer, Albert
New American Library, 1960
Buku Teks
Minn University of Minnesota Press, 1996
Buku Teks
Yugianti S. Soelaiman, author
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 1983
UI - Skripsi (Membership)