White, John Kenneth, author
Wadsworth/Thomson learning, 2004
Buku Teks
Henderson, H. James, author
McGraw-Hill, 1974
Buku Teks
Sorauf
Little, Brown and Company, 1980
Buku Teks
Burns, James McGregor, author
Prentice-Hall, 1963
Buku Teks
Bone, Hugh A., author
McGraw-Hill, 1965
Buku Teks