Acton, H.B.
Longmans, 1971
Buku Teks
Sekhar, R.C.
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Buku Teks
Maidment, Frederick, author
Prentice-Hall, 1999
Buku Teks
Maidment, Frederick, author
Prentice-Hall, 2000
Buku Teks
Ferrell, O.C., author
Cengage Learning, 2015
Buku Teks