Norton, Henry K.
Allen & Unwin , [date of publication not identified]
Buku Teks
Vandenbosch, Amry
University of Kentucky Press, 1957
Buku Teks
Fishers, David A.
West Publishing Company, 1994
Buku Teks
Asad-ul Iqbal Latif
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Buku Teks
Australia EAAU 1996,
Buku Teks