Rogers, Robert W. ,author
DDI Press, 2011
Buku Teks
Steel, Danielle, author
A Dell book, 1984
Buku Teks
Gruber, Ruth, author
Hill and Wang, 1960
Buku Teks
Gruber, Ruth, author
Hill and Wang, 1960
Buku Teks
Shuster, George N.
Harper & Row,Publishers, 1963
Buku Teks