Powis, David, author
McGraw-Hill, 1977
Buku Teks
Compton, Robert R., author
Wiley Eastern Private, 1968
Buku Teks
Parmley, Robert O., author
McGraw-Hill, 1981
Buku Referensi
Brewer, Richard, author
Saunders College Publishing, 1982
Buku Referensi
Forst, Brian, author
Cambridge University Press, 2009
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