Pai, Young, author
Merrill Prentice Hall, 2001
Buku Teks
Brembeck, Cole S.
John Wiley & Sons, 1967
Buku Teks
Allyn and Bacon, 1991
Buku Teks
Black, Jill M., author
Jossey-Bass, 2010
Buku Teks
Paterson, Robert G. (Robert Gildersleeve), author
McGraw-Hill, 1950
Buku Teks