Homan, Mark S., author
Cengage Learning, 2016
Buku Teks
Drucker, Peter F. (Peter Ferdinand), 1909-2005, author
Times Books International, 1985
Buku Teks
William I. Hitchcock, Melvyn P. Leffler, Jeffrey W. Legro.
Massachusetts Harvard University Press, 2016
Buku Teks
Gilbert, Neil, author
Prentice-Hall, 1977
Buku Teks
Roemer, Milton I., author
Oxford University Press, 1991
Buku Referensi