Webb, James, author
Avon Books, 1992
Buku Teks
Groom, Winston, author
Pocket Books, 1995
Buku Teks
Böll, Heinrich, author
Verlag Hans Bredow-Institut, 1958
Buku Teks
Smith, Wilbur, author
Pan Bookes, 1990
Buku Teks
Kenia Shaulisafa, author
Fakultas Teknik Universitas Indonesia, 2018
UI - Skripsi (Membership)