Lawrence, John A
John Wiley & Sons, 2002
Buku Teks
Thomas N. Ingram...[et al.]
Harcourt College Publishers, 2001
Buku Teks
edited by Randy Y. Hirokawa and Marshall Scott Poole
Sage, 1986
Buku Teks
Dixon, John R.
McGraw-Hill, 1966
Buku Teks
Bunn, Derek W., author
McGraw-Hill, 1984
Buku Teks