Johnson, Miranda, author
Oxford University Press, 2016
eBooks
Moon, Glenn W., author
Holt, Rinehart and Winston, 1964
Buku Teks
Adrian, Charles R., author
McGraw-Hill , 1978
Buku Teks
Thompson, Mark P., author
Sweet & Maxwell, 1995
Buku Teks
Curzon, L. B., author
Pitman, 1993
Buku Teks