Kirkpatrick, Lee A., author
Wadsworth and Cengage Learning, 2011
Buku Teks
Field, Andy P, author
Sage Publications, 2018
Buku Teks
Williams, Helen M., author
SAGE, 2020
Buku Teks
Norusus, Marija, author
SPSS Inc, 1990
Buku Teks
Heck, Ronal H., author
Routledge, 2014
Buku Teks