Schwartz, David Joseph, author
Pustaka Delapratasa, 1999
Buku Teks
Gilbert, Elizabeth, author
Kaifa, 2017
Buku Teks
MacMillan, Kathy, author
[American Management Association, ], 2009
eBooks
Schwartz, David Joseph, author
Binarupa Aksara, 1996
Buku Teks
Hughes, Langston
Prentice-Hall, 1967
Buku Teks