Holmes, Larry, author
Jones and Bartlett , 2010
Buku Teks
Newman, Donald G.
John Wiley & Sons, 1978
Buku Teks
Timings, R.L. (Roger Leslie), 1927-, author
Longman, 1988
Buku Teks
Donna Boyd
Mosby Elsevier , 2009
Buku Teks
Cambridge University Press, 2019
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