Deller, Ruth A., author
Emerald Publishing Limited, 2019
eBooks
Emerald Publishing Limited, 2019
eBooks
Kornblum, William, author
Harcourt Brace College Publishers, 1997
Buku Teks SO
Kornblum, William, author
Wadsworth and Cengage Learning, 2012
Buku Teks SO
Bryjak, George J
Allyn and Bacon, 1994
Buku Teks