Berlo, David K.
Holt, Rinehart and Winston, 1960
Buku Teks
Baran, Stanley J., author
Wadsworth and Cengage Learning, 2012
Buku Teks
Sears, Francis W. (Francis Weston), 1898-1975, author
Addison-Wesley, 1975
Buku Teks
Harris, Edward G., author
John Wiley & Sons, 1975
Buku Teks
West, Richard L., author
Mayfield Publishing company , 2000
Buku Teks