Keith, Lyman A., author
McGraw-Hill, 1975
Buku Teks
Hegar, Kathryn
Houghton Mifflin, 1985
Buku Teks
Paulson, Edward, author
Prenada Media, 2003
Buku Teks
Griffin, Ricky W., author
Pearson Education International, 2006
Buku Teks
Griffin, Ricky W., author
Prentice-Hall, 1999
Buku Teks