Ewen, David, author
Prentice-Hall, 1989
Buku Referensi
Ewen, David, author
Prentice-Hall, 1952
Buku Teks
Li, Lanqing, author
Gale Asia, 2009
Buku Teks
Carlson, Paul A., author
South Western, 1957
Buku Teks
edited by E.M. Kirkpatrick ; assistant editors, C.M. Schwarz ... [and others]
Chambers, 1983
Buku Referensi