Agarwal, R. D., author
Tata McGraw-Hill, 1986
Buku Teks
Morgan, Gareth
Sage Publications, 1986
Buku Teks
Griffin, Ricky W., author
Cengage Learning, 2014
Buku Teks
Pugh, D. S.
Buku Teks
Morgan, Gareth, 1943-, author
SAGE Publications, Inc, 2006
Buku Teks