Goyal, Sandeep, author
CBS Publishers, 2015
Buku Teks
Cobourne, Martyn T., author
Elsevier , 2016
Buku Teks
Houston, W.J.B. (William John Ballantyne), author
Butterworth-Heinemann, 1992
Buku Teks
Proffit, William R, author
Mosby, 2000
Buku Referensi
Cleese, John
BBC Worldwide Limited, 2003
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