Griffin, Keith, author
St. Martin Press, 1989
Buku Teks
Todaro, Michael P., author
Erlangga, 2006
Buku Teks
Gill, Richard T. (Richard Thomas), 1927-2010, author
Prentice-Hall, 1963, 1967
Buku Teks
Todaro, Michael P., author
Addison-Wesley, 2003
Buku Teks
Todaro, Michael P., author
Erlangga, 1998
Buku Teks