Howell, David C., author
Cengage Learning, 2017
Buku Teks
Howell, David C., author
Thomson Higher Education, 2004
Buku Teks
Howell, David C.
Thomson/Wadsworth, 2008
Buku Teks
Siegel, Sidney, author
McGraw-Hill , 1988
Buku Teks
Jaccard, James, author
Wadsworth, 1983
Buku Teks