Howell, David C.
Cengage Learning, 2017
Buku Teks
Howell, David C.
Thomson/Wadsworth, 2008
Buku Teks
Jaccard, James
Wadsworth, 1983
Buku Teks
Gravetter, Frederick J.
Cengage Learning, 2013
Buku Teks
Gravetter, Frederick J.
Wadsworth and Cengage Learning, 2013
Buku Teks