Orwell, George, 1903-1950, author
Bentang , 2016
Buku Teks
Cleveland P. Hickman [and others]
McGraw-Hill, 2015
Buku Teks
P. McDonald ... [et al.]
Longman, 1995
Buku Teks
Tinberger, Niko, author
Time Life Book, 1970
Buku Teks
Scott, John Paul, author
The University of Chicago Press, 1958
Buku Teks