Cox, N. J. (Nicholas J, author
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Buku Teks
Leger, A.S. St., author
Open UNiversity Press, 1999
Buku Teks
Mitchell, Michael N., author
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Buku Referensi
Kohler, Ulrich, author
Stata Press, 2009
Buku Teks
Cameron, Adrian Colin, author
Stata Press, 2010
Buku Teks