Field, Andy P., author
SAGE Publications, 2016
Buku Teks
Kronstadt, Babette, author
John Wiley & Sons, 1994
Buku Teks
SPSS Inc., 1997
Buku Referensi
Coakes, Sheridan J., author
John Wiley & Sons, 2001
Buku Teks
Coakes, Sheridan J., author
John Wiley & Sons, 2003
Buku Teks