Rowe, David Nelson
Harcourt, Brace and Company, 1945
Buku Teks
Norton, Henry K.
Allen & Unwin , [date of publication not identified]
Buku Teks
Vandenbosch, Amry, author
University of Kentucky Press, 1957
Buku Teks
Fishers, David A.
West Publishing Company, 1994
Buku Teks
Asad-ul Iqbal Latif
ISEAS, 2007
Buku Teks