Mitchell, Michael N., author
Stata Press Publication, 2008
Buku Referensi
Mitchell, Michael N., author
Stata Press, 2012
Buku Teks
Cox, N. J. (Nicholas J, author
Texas Stata Press, 2014
Buku Teks
College Station , 1995
Buku Teks
Wolfe, R. J., author
Oxford University Press, 2000
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